A computer battery has a normal distribution with an average life span of 10 hours and a standard deviation of 3 hours. a. What is the probability that the computer battery will last between 10 and 14...

A computer battery has a normal distribution with an average life span of 10 hours and a standard deviation of 3 hours.
a. What is the probability that the computer battery will last between 10 and 14 hours?
b. Find out how many hours at least 12% of the computer batteries with the longest endurance.
c. A company bought 10 of these computers. What is the probability that the battery life of at least 2 of the purchased computers is within the range specified in “a”?