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:

Step 2. Give the probability for step 1:

Step 3. Calculate the z-score for $80.00:

Step 4. Give the probability for step 3:

Step 5. Add the probabilities from steps 1& 3:

Question

8 September, 23:59

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Answers (1)

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Kaylah Benson · Answer 1

I'm not sure but I think you should to step 3 which is calculate the z-score for 80.00 dollars