Basic Math question and answers for September 04, 2024
- Q The time to deliver a pizza is normallydistributed with mean 22 minutes andstandard deviation 7 minutes. During 1000deliveries, in 52 cases the pizzas weredelivered in less than x minutes. Find...
- Q The weight of newborn pigs is normally distributed with mean 1.4 kg and standard deviation 0.3 kg. What is the interquartile range? Give your answer correct to 3 significant figures.
- Q Use z scores to compare the given values.Based on sample data, newborn males have weights with a mean of 3279.8 g and a standard deviation of 617.6 g. Newborn females...
- Q The weights of newborn giraffes arenormally distributed with mean 55 kg andstandard deviation 10 kg.What percentage of giraffes selected atrandom weigh between 50 kg and 60 kg?Give your answer correct...
- Q The accompanying table provides a probability distribution for the number of major hurricanes, Y, for a randomly selected year between 1851 and 2012. Complete parts (a) through (c) below.Click the...
- Q In a study of speed dating, female subjects were asked to rate the attractiveness of their male dates, and a sample of the results is listed below (1= not attractive;...
- Q Suppose that a certain ant has a mean lifespan of 5.6 days with astandard deviation of 1.4 days. Assume that the lifespan of thisinsect is approximately normally distributed.(a) Calculate the...
- Q A nurse at a local hospital is interested in estimating the birth weightof infants. How large a sample must she select if she desires to be99% confident that the true...
- Q A national caterer determined that 87% of the people who sampled their food saidthat it was delicious. A random sample of 144 people is obtained from a population5000. The 144...
- Q Hospital floors: Hospital floors are usually bare tiles instead of carpet. Carpets will decrease noise but might increase germ growth.To study this, researchers installed carpet in 8 of 16 hospital...
- Q Assume that the heights of men are normally distributed with a mean of 66.9 inches and a standard deviation of 2.1 inches. If 36 men are randomly selected, find theprobability...
- Q Do consumers spend more on a trip to Walmart or Target? Suppose researchers in- terested in this question collected a systematic sample from 85 Walmart customers and 80 Target customers...
- Q Suppose a population has a mean of 7 for some characteristic of interest and a standard deviation of 9.6. A sample is drawn from this population of size 64. What...
- Q Suppose are running a study/poll about the probability of catching the flu this year. You randomly sample 90 people and find that 62 of them match the condition you are...
- Q Tweet tweet: An article reported that 73% of companies have Twitter accounts. An economist thinks the percentage is higher at technology companies. She samples 70 technology companies and finds that...
- Q Listed below are speeds (mi/h) measured from traffic on a busy highway. This simple random sample was obtained at 3:30 P.M. on a weekday. Use the sample da deviation.61 62...
- Q 4) A person is taking a 12-question multiple-choicetest for which each question has three answerchoices, only one of which is correct. The persondecides on answers by rolling a fair die...
- Q During a football game, the visiting team was given 4 penalties for 15 yards each. What was the change in the visiting tear's field position due to these penalties?A -90...
- Q (1 point) According to a recent marketing campaign, 120 drinkers of either Diet Coke or Diet Pepsi participated in a blind tasteof the drinks was their favorite. In one Pepsi...
- Q Use a standard normal distribution table to find the percentage of area under the standard normal curve that is specified.Below z = -1.49Click the icon to view the standard normal...
- Q Test the claim that the mean GPA of night students is larger than 2.4 at the 0.05 significance level.The null and alternative hypothesis would be:Ho:p= 0.6 Ho: ? 2.4 Ho:p>...
- Q Listed below are the lead concentrations (in g/g) measured in different Ayurveda medicines. Ayurveda is a traditional medical system commonly used in India. The lead concentrations listed here are from...
- Q Spam: A researcher reported that 71.8% of all email sent in a recent month was spam. A system manager at a large corporation believes that the percentage athis company may...
- Q In a television series there is exactly onecrime committed in every episode. It hasbeen observed that the probability that thecriminal is male in an episode is (0.35).What is the probability,...
- Q A machine fills bags of candy. Due to slight irregularities in the operation of the machine, not every bag gets exactly the same number of pieces. Assume that thenumber of...
- Q A poll is given, showing 80% are in favor of a new building project.If 8 people are chosen at random, what is the probability that exactly 1 of them favor...
- Q Good credit: The Fair Isaac Corporation (FICO) credit score used by banks and other lenders to determine whether someone is a good credit risk. Scoresrange from 300 to 850, with...
- Q A biased coin is weighted so that the probability of obtaining a head is 5/7. The coin is tossed 15 times. Let X denote the number of heads obtained. Find...
- Q In a multiple choice test, there are 10 questions. Each question has 4 choices, one of which is correct. Tom, who knows nothing about the subject, guesses each answer at...
- Q 2% of a group of toys are defective. A random sample of 100 toys is chosen from the group. Let (X) be the number of defective toys in the sample....
- Q For a standard normal distribution, find:P(Z > c) = 0.3365Find c.Round your answer to 3 decimal places (e.g. 0.001).Hint: Use technology such as Normal Curve Calculator.
- Q A manufacturing machine has a 1% defect rate.If 3 items are chosen at random, what is the probability that at least one will have a defect?Round your answer to 4...
- Q For a standard normal distribution, given:P(Z < c) = 0.6645Find c.Round your answer to 3 decimal places (e.g. 0.001).
- Q Suppose your manager indicates that for a normally distributed data set you are analyzing, your company wants data points between z = 1.4 and z= 1.4 standard deviations of the...
- Q A poll of 1018 teens aged 13 to 17 showed that 56% of them have made new friends online. Use a 0.05 significance level to test the claim that half...
- Q A particular brand of laptop was sampled with regard to the time it can be used before it requires recharging. The mean time was calculated to be 7.6 hours with...
- Q Intelligence Quotient (IQ) scores are often reported to be normally distributed with = 100.0 and 15.0. A random sample of 35 people is taken. Step 1 of 2: What is...
- Q In the video, we found the area under the curve that lies in the region between two z-scores. Which of the following statements is NOT true?Choose the correct answer below.OA....
- Q Ted is not particularly creative. He uses the pickup line "If I couldrearrange the alphabet, I'd put U and I together." The random variable x isthe number of women Ted...
- Q A population of values has a normal distribution with u 219.4 and ? = 27.2. You intend to drawa random sample of size n = 19.Find the probability that a...
- Q Engineers must consider the breadths of male heads when designing helmets. The companyresearchers have determined that the population of potential clientele have head breadths that are normally distributed with a...
- Q In 1948, the baseball player Frankie Fleetfoot hit 0.365. In the 1940s the mean batting average was 0.264 and the standard deviation was 0.0331. In 1977, Sam Slugger hit 0.340....
- Q If a company spends million dollars on research, it sales will be s million dollars, where r and s are related by s = 3 55.(a) Find ds/dr by implicit...
- Q A normal distribution has a mean of 18 and a standard deviation of 5. Use the 68-95-99.7 rule to find the percentage of values in the distribution between 18 and...
- Q Consider the probability distribution of X, where X is the number of times a college graduate changed majors.We collect a random sample of 1000 college graduates. Based on the probability...
- Q Assume that a normal distribution of data has a mean of 20 and a standard deviation of 2. Use the 68-95-99.7 rule to find the percentage of values that lie...
- Q 9 of 14Suppose we have a large group of cattle and record their weights. We then make probability histograms with thedata in the following two ways:Method 1: With 100 bins...
- Q Tandonny selects sgroupsCG,and the random variable x is the number in the group who say that themost fun way to flirt is in person. Determine whether a probabilitydistribution is given....
- Q Under his cell phone plan, Noah pays a flat cost of $66.50 per month and $4 pergigabyte. He wants to keep his bill under $80 per month. Which inequality can...
- Q In a survey of men in the United States (ages 20 to 29), the mean height was 69.9 inches with a standard deviation of 3.0 inches. Assume the height data...
- Q In a survey of 2035 workers, 73% reported working out 3 or more days a week. What is the margin of error? What is the interval that is likely to...
- Q A company produces steel rods. The lengths of the steel rods are normally distributed with a meanof 209.3-cm and a standard deviation of 2.4-cm. For shipment, 28 steel rods are...
- Q Determine the range, mean, and standard deviation of the data set.(5, 10, 5, 17, 17, 9, 13, 14)The range is (Type a whole number.)The mean is (Type an integer or...
- Q What is wrong the following conclusion? All students in North Carolinashould take an online SAT course in order to help improve their score. Thisconclusion came from students at Mathville High...
- Q On March 10, 2020, nine NBA games were played. The averagenumber of points scored in those games was 226, with a samplevariance of 122.5.Assuming that the underlying distribution of the...
- Q The combined SAT scores for the students at a local high school are normally distributed with a mean of 1545 and a standard deviation of 300. The local college includes...
- Q Archeologists have studied sizes of Egyptian skulls in an attempt to determine whether breeding occurred between different cultures. Listed below are the widths (mm) of skulls from 150 A.D. Construct...
- Q Anthony wants to repay the loan his parents gave him in three years. How much does heneed to deposit into an account semi-annually that pays 3.25% interest twice a year...
- Q NextA manufacturer knows that their items nave a lengths that are skewed right, with a mean of 18.1inches, and standard deviation of 1.3 inches.If 34 items are chosen at random,...
- Q A population has parameters ? = 94.2 and a = 74.7. You intend to draw a random sample of sizen= 146.What is the mean of the distribution of sample means?Pa...
- Q Below is a list of the salaries for the starting lineup of the local pro baseball team.Pitcher: $1,100,000Catcher: $1,800,000Infield: $495,000 $495,000 $1,600,000 $2,400,000Outfield: $510,000 $7,000,000 $8,500,000Find the salary mean, median,...
- Q The mathematical model C = 400x + 60,000 represents the cost in dollars a company has in manufacturing x items during a month. How many items were produced if costs...
- Q Sixty five percent of adults favor some kind of government control on the prices of medicines. What is the probability that the proportion of adults in a random sample of...
- Q Problem: Mr. Zack, the founder of Facelook, recently announced that an average person spends about 60 minutes per day on social media. Assume that the time spent on the social...
- Q A recent poll of 2300 randomly selected 18-25-year-olds revealed that 266 currently use marijuana or hashish. According to a publication, 12.7% of 18-25-year-olds were current users of marijuana or hashish...
- Q A new cream that advertises that it can reduce wrinkles and improve skin was subject to a recent study. A sample of 62 women over the age of 50 used...
- Q The five number summary of a dataset was found to be:1, 7, 10, 14, 20An observation is considered an outlier if it is below:An observation is considered an outlier if...
- Q In order to find the average speed of cars on Interstate 95, researchers set up an observational study on the side of the road. Researchers gathered a sample of 10...
- Q The National Association of Realtors estimates that 23% of all homes purchased in 2004 were considered investment properties. If a sample of 800 homes sold in 2004 is obtained what...
- Q Provide an appropriate response.The average score of all golfers for a particular course has a mean of 70 and a standard deviation of 3.5. Suppose 49 golfers played the course...
- Q Provide an appropriate response.One year, professional sports players salaries averaged $1.9 million with a standard deviation of $0.9 million. Suppose a sample of 400 major league players was taken.Find the...
- Q Fill in the blanks.TheS=TheS=of a sample of n data values is denoted by s, which is defined as follows by the formula below.......of a sample of n data values is...
- Q Han is about to mow some lawns in hisneighborhood. His lawn mower has a 5-gallonfuel tank, but Han is not sure how muchgasoline is in the tank.He knows, however, that...
- Q A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the drug, 28 subjects had a mean wake...
- Q In a study, the sample is chosen by separating all cars by size, and selecting 10 of each size groupingWhat is the sampling method?Simple RandomSystematicStratifiedClusterConvenience
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