Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.0125) and its Z score.
Z = ±2.24
Mean = (48-42)/2 = ?
Z = (score-mean)/SD
Insert values for Z, score and mean to solve for SD (sigma).
in a certain normal distribution , 1.25% of the area lies to the left of 42 , and 1.25% of the area lies to the right of 48. find population mean and sigma
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I almost didn't answer your post, because "statics" relates to physics. If you want to shorten statistics, stats would be better.
2 answers