A day care program has an average daily expense of $75 the standard division of $15 the owner takes a sample of 64 bills what is the probability that the mean of his sample will be between $70 and $80 step1 calculate the z-score for $70. 23.6,11.8,-0.3

step2 give the probability for Step 1.
0.3,11.8,23.6

step 3 calculate the z-score for $80.
11.8,0.3,23.6

step4 give the probability for step 3.
23.6,11.8,0.3

step 5 at the probability for Step 1 and 3
23.6,11.8,0.3