The dmv reports that the average of a vehicle is 9 years old with a STDV of 18 months. For a random sample of 20 vehicles what is the probability that the average age of vehicles in the sample is between 10 and 15 years old. Answer: 4 decimal places
(We want Z score to be between (10 -9)/ 1.5 /SQR 20 and (15 -9)/1.5/SQR20
between 2.98 and 17.89
almost = area to right of 2.98
Probability = 1 -0.9986 = 0.0014
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