Question

Assume the annual day care cost per child is normally distributed with a mean of $8000 and a standard deviation of $500. In a random sample of 110 families, how many pay morethan $7745 annually for day care per child?of the 110 familles, approximately pay more than $7745 annually pr day care per child.(Round to the nearest whole number as needed.)

Answer 1

`P(X>7745)=P(Z>-0.51)=0.695`

so the amount of families that pay more than 7745 is:

`110\cdot0.695=76.45\approx76`