Question

A day care program has an average daily expense of $75.00. The standard deviation is $15.00. The owner takes a sample of 64 bills. What is the probability the mean of his sample will be between $70.00 and $80.00?

Step 1. Calculate a z-score for $70.00:

Answer 1

I just guessed but I got 100% on the lesson so I guessed correctly lol

1. -0.3

2. 11.8

3. 0.3

4. 11.8

5. 23.6

Explanation:

Answer 2

The z score of $70.00 = (70 - 75)/15 = -5/15 = -0.3333