Question 322995
Insurance companies have determined that US males between the ages of 16 and 24 drive an average of 10,718 miles each year with a standard deviation of 3763 miles. Assume the datea is normally distributed. For a randomly selected male in that age group, per year...i have a formula that i used...i'm just confused because some questions say less than...and some say more than...just wanted to ensure i did this correctly: (12000-10718)/3763=.3407
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Good. That is the z-value of 12000
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"Find the probability that he drives less than 12,000 miles."
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Then P(x < 12000) = P(z < 0.3407) = normalcdf(-1000,0.3407) = 0.6333
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Cheers,
Stan H.