Question

Use the z-distribution table on pages A-1 and A-2 or technology to solve.
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?
A.) about 10.2 years
B.) about 5.9 years
B.) about 4.8 years
D.) about 2.1 years

Answer 1

Approximately 75% of cars driven by company employees are older than  about 5.9 years

Step-by-step explanation:

Let say 75% of  cars older than age  = Y  years

than 25 % cars of age less than Y Years

Z score corresponding to 25 %  =  -0.674

Z score = (Value - Mean) /SD

Value = Y

Mean = 8

SD = 3.2

Z score = -0.674

-0.674 = (Y - 8)/3.2

=> Y =5.84 Years

=> Y ≈ 5.9 Years

Approximately 75% of cars driven by company employees are older than  about 5.9 years

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Answer 2

Answer:

5.9

Step-by-step explanation:

I got it correct.