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

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:

anonymous · Answer

The right answer would be..
$$99.3$$