The average hourly wage of workers at a fast food restaurant is $6.50/hr. Assume the wages are normally distributed with a standard deviation of $0.45. If a worker at this fast food restaurant is selected at random, what is the probability that the worker earns more than $6.75?
A) 28.8%
B) 27.6%
C) 42.1%
D) 5.2%

Question

Quizplus · Accepted Answer

The probability that a worker earns more than $6.75 is the area under the normal distribution curve to the right of $6.75. Using a standard normal distribution table, we find that the area to the right of z = (6.75 - 6.50) / 0.45 = 0.56 is 0.2881, or 28.8%.

The Average Hourly Wage of Workers at a Fast Food