Homework Help: Math Help Please!!!!!

Posted by Taylor on Sunday, March 10, 2013 at 10:04pm.

The number of pounds gained during pregnancy are normal with mean=30.23 and st. deviation=13.84

Determine the percent of women that gain between 20 and 30 pounds.

Math Help Please!!!!! - Dr. Jane, Sunday, March 10, 2013 at 10:10pm
You have to subtract the mean from each score and divide by the standard deviation.

This will give you two z-scores

One for (20 -30.23)/13.84

the other one (30 - 30.23)/13.84

Use a standard z (normal table) to find the area under the curve between these two numbers. That will give you the percent of women in that range.

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