NARRBEGIN: DVD Rental Store
DVD Rental Store
a DVD Rental $\tilde{ p }$

NARRBEGIN: DVD Rental Store
DVD Rental Store
A DVD rental store wants to know what proportion of its customers are under age 21. A simple random sample of 500 customers was taken, and 375 of them were under age 21. Presume that the true population proportion of customers under age 21 is 0.68.NARREND
-{DVD Rental Store Narrative} Find the mean and standard deviation of $\tilde{ p }$ .