Question

weekly wages at a certain factory are normally distributed woth a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500​

Answer 1

See below

Explanation:

450 is 1 standard deviation above mean : z - score +1 corresponds to

.8413 (from z-score table)

500 is 2 S.D. for z-score of 2 corresponds to .9772

.9772 - .8413 = .1359 or 13 . 59 %