A study found that the mean amount of time cars spent in?drive-throughs of a certain? fast-food restaurant was

157.6157.6

seconds. Assuming? drive-through times are normally distributedwith a standard deviation of

3434

?seconds, complete parts? (a) through? (d) below.Click here toview the standard normal distribution table (page 1).

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Click here to view the standard normal distribution table (page2).

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?(a) What is the probability that a randomly selected car willget through the? restaurant's drive-through in less than

118118

?seconds?The probability that a randomly selected car will getthrough the? restaurant's drive-through in less than

118118

seconds is

nothing.

?(Round to four decimal places as? needed.)

?(b) What is the probability that a randomly selected car willspend more than

210210

seconds in the? restaurant's drive-through?The probability thata randomly selected car will spend more than

210210

seconds in the? restaurant's drive-through is

nothing.

?(Round to four decimal places as? needed.)

?(c) What proportion of cars spend between

22

and

33

minutes in the? restaurant's drive-through?The proportion ofcars that spend between

22

and

33

minutes in the? restaurant's drive-through is

nothing.

?(Round to four decimal places as? needed.)

?(d) Would it be unusual for a car to spend more than

33

minutes in the? restaurant's drive-through?? Why?