At a large department store, the average number of years of employment for a cashier is 5.7 with a standard deviation of 1.8 years, and the distribution is approximately normal. If an employee is picked at random, what is the probability that the employee has worked at the store for over 10 years?
A) 99.2%
B) 49.2%
C) 1.7%
D) 0.8%

Question

Quizplus · Accepted Answer

The probability can be found using the Z-score formula. A Z-score of approximately 2.39 corresponds to a probability of about 0.8% for being over 10 years.

At a Large Department Store, the Average Number of Years