Homework Help: Math

Posted by Tammy Jones on Friday, December 21, 2012 at 9:19am.

Suppose that people's heights (in centimeters) are normally distributed, with a mean of 175 and a standard deviation of 6. We find the heights of 80 people.

(a) How many would you expect to be between 167 and 183 cm tall?

(b) How many would you expect to be taller than 170 cm?

Math - PsyDAG, Friday, December 21, 2012 at 11:42am
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 related to the Z scores. Multiply that proportion by 80.

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