Quick Start Batteries make 12 volt car batteries. The adverage life of a quiz start battery is normally distributed, with a mean of 45 months and a...

Quick Start Batteries make 12 volt car batteries. The adverage life of a quiz start battery is normally distributed, with a mean of 45 months and a standard deviation of 8 months. if a random sample of 600 batteries is selected, how many batteries would weigh last more than 48 months?