Z = (score-mean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability from the Z score.
Why not you?
the life of light bulbs is distributed normally. The variance of the life time is 225 and the mean lifetime of a bulb is 590 hours. Find the probability of a bulb lasting for at most 603 hours. Yeah, WTF??? Why me!??!
3 answers
marshall
The diameters of ball bearings are distributed normally. The mean diameter is
87
millimeters and the standard deviation is
6
millimeters. Find the probability that the diameter of a selected bearing is greater than
84
millimeters. Round your answer to four decimal places.
87
millimeters and the standard deviation is
6
millimeters. Find the probability that the diameter of a selected bearing is greater than
84
millimeters. Round your answer to four decimal places.
1 answer