# The average age of a vehicle registered in the United States is 8 years (96 months).... The average age of a vehicle registered in the United States is 8 years (96 months). the ages are normally distributed with a standard deviation of 16 months. Assume 7. a car is selected randomly, what is the probabilty that its age is between 91 and 102 months? b. If a random sample of 36 vehicles is taken, what is the probability that the mean of their ages is between 91 and 102 months? 8. (Check your homework notes). In the above problems involving samples, we have used the table to calculate probabilities involving the means of the normal distribution probability samples. In order to use this table,one of two criteria about the sample is necessary. are these criteria? What a. b. c. The proper name for the symbol "a/Nn" is 9. The EMT industry reports that the average time it takes to respond to an emergency call is 25 minutes. Assume that this time is normally distributed with a sigma of 4 minutes. What percentage of calls will be responded to in less than 20 minutes? #### Earn Coin

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