The lifetime of a particular type of car tire is normally
distributed. The mean lifetime is 50,000 miles, with a
standard deviation of 5,000 miles. Of a random sample of
15,000 tires, how many of the tires are expected to last for
between 45,000 and 55,000 miles?
0 7,125
o 10,200
o 14.250
14,850