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Use technology or a z-distribution table to find the indicated area.

Suppose ages of cars driven by company employees are normally distributed with a mean of 8 years and a standard deviation of 3.2 years. 

Approximately 75% of cars driven by company employees are older than what age?

 2.1

 4.8

 5.9

10.2

 Mar 18, 2019
 #1
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Using a z-score table,   +.67 SD is 74.86 percent    and  +.68 SD is 75.17 % of all the cars   I'll just use .674 SD

.674 x SD = .674 x 3.2 = 2.157 yrs

    Add this to the median      8 + 2.157 = 10.157 yrs ~~ 10.2 yrs.

 Mar 18, 2019

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