A computer instructor found out that on average, his students complete their modules in 120 hours with a standard deviation of 10 hours. Assuming that his data are normally distributed, what is the...

Extracted text: A computer instructor found out that on average, his students complete their modules in 120 hours with a standard deviation of 10 hours. Assuming that his data are normally distributed, what is the probability that a randomly selected student will complete his module in 100 to 140 hours? Write your answer correct to four decimal places, as in 0.1234.