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:

satellite73 · Answer

we can do this, probably with a computer

satellite73 · Answer

although you probably don't need one
$70 is 5 below $75 right?

maddielyn · Answer

yes

Falconmaster · Answer

Do you still need help on this?