The average life of a car tire is 50,000 miles. The standard deviation is 2,000 miles What percent of the tires will last longer than 52,000 miles? If a tire store purchased 400 tires, how many tires...

The average life of a car tire is 50,000 miles.  The standard deviation is 2,000 miles

What percent of the tires will last longer than 52,000 miles?

If a tire store purchased 400 tires, how many tires would you expect to last longer than 54,000 miles?