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The average age of a vehicle registered in Canada is about 97 months. If a random...

The average age of a vehicle registered in Canada is about 97 months. If a random sample of 31 vehicles is selected, find the probability that the mean of their age is between 101 and 105 months. Assume the standard deviation for the population is 21.

Solutions

Expert Solution

Given that, mean (μ) = 97 months

standard deviation = 21

Sample size (n) = 31

We want to find,

Therefore, required probability is 0.1276

​​​​​​NOTE : If we used TI-83 plus calculator to find above probability we get, probability = 0.1275

milcah answered 1 year ago
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