Posted by Taylor on .
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!!!!! -
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.