Asked by Angel

The distribution of heights of women aged 20 to 29 is approximately normal with a mean of 2.8 inches and standard deviation of 2.8 inches. The height (+/- 0.1 inch) of the middle 99.7% falls between a low of ?? inches and a high of ?? inches.

Please help on how I set this up to find the answer.
Answered by Angel
sorry. its 62.8 for the mean
Answered by PsyDAG
.997 = mean ± Z * SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.003/2) and its Z score. Insert data into above equation and solve.
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