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Please only show me the graphs I know the answers to below problems. I don't know...

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Basic Math

Please only show me the graphs I know the answers to belowproblems. I don't know how to do the graphs correctly.

1. A radar unit is used to measure speeds of cars on a motorway.The speeds are normally distributed with a mean of 90 km/hr and astandard deviation of 10 km/hr. What is the probability that a carpicked at random is travelling at more than 100 km/hr?

2. For a certain type of computers, the length of time bewteencharges of the battery is normally distributed with a mean of 50hours and a standard deviation of 15 hours. John owns one of thesecomputers and wants to know the probability that the length of timewill be between 50 and 70 hours.

3. Entry to a certain University is determined by a nationaltest. The scores on this test are normally distributed with a meanof 500 and a standard deviation of 100. Tom wants to be admitted tothis university and he knows that he must score better than atleast 70% of the students who took the test. Tom takes the test andscores 585. Will he be admitted to this university?

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