# Question: The car speeds on a certain stretch of the interstate

The car speeds on a certain stretch of the interstate highway I-95 are known to be normally distributed with a mean of 72 and a standard deviation of 15. You have just heard a policeman comment that about 3% of the drivers drive at extremely dangerous speeds. What range of speeds is he referring to?

**View Solution:**## Answer to relevant Questions

The average household income in a community is known to be $80,000. Also, 20% of the households have an income below $60,000 and anoher 20% have income above $90,000. Is it reasonable to use the normal distribution to model ...In 2010, Apple introduced the iPad, a tablet-style computer that its former CEO Steve Jobs called a" a truly magical and revolutionary product" (CNN, January 28, 2010). Suppose you are put in charge of determining the age ...A random sample of size n=100 is taken from a population with mean µ =80 and standard deviation σ =14. a. Calculate the expected value and the standard error for the sampling distribution of the sample mean. b. What is the ...Last year, the typical college student graduated with $27,200 in debt (The Boston Globe, May 27, 2012). Let debt among recent college graduates be normally distributed with a standard deviation of $7,000.a. What is the ...A car manufacturer is concerned about poor customer satisfaction at one of its dealerships. The management decides to evaluate the satisfaction surveys of its next 40 customers. The dealer will be fined if the number of ...Post your question