A sample of 500 evening students revealed that their annual incomes were normally distributed with a mean income of $50,000 and a standard deviation of $4,000. How many students earned more than $55,000?

Question

Quizplus · Accepted Answer

To find the number of students earning more than $55,000, calculate the z-score: z = (55,000 - 50,000) / 4,000 = 1.25. Using the standard normal distribution table, the probability of a z-score greater than 1.25 is approximately 0.1056. Thus, 0.1056 * 500 ≈ 53 students.

A Sample of 500 Evening Students Revealed That Their Annual