Algebra 2 help!

Question

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? Show your work and provide the exact answer.

10.2 years

5.9 years

4.8 years

2.1 years

Answer 1

Prob ( z < K) = 0.75 <--- what is the z-score whose probability is 0.75????

REVERSE table lookup or norm.inv in excel gives K=

x = k*stndDev + mean = 0.67449 * 3.2 + 8

= 10.158368