Suppose a brand of light bulbs is normally distributed, with

Last updated: 7/8/2022

Suppose a brand of light bulbs is normally distributed, with a mean life of 1500 hr and a standard deviation of 100 hr. Find the probability that a light bulb of that brand lasts between 1390 hr and 1630 hr. The probability that a light bulb will last between 1390 hr and 1630 hr is