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December 10, 2016

# Homework Help: Math

Posted by Gia on Thursday, May 24, 2012 at 5:57am.

Last year, the personal best high jumps of track athletes in a nearby state were normally distributed with a mean of 229 cm and a standard deviation of 19 cm. What is the probability that a randomly selected high jumper has a person best between 229 and 248 cm?

According to a poll conducted in a company, 47% of the employees regularly use the internet while at work. You conduct a similar survey at your mother's office where there are 250 respondents. What is the probability you find between 102 and 117.5 employees who use the internet while at work?

I have no idea how to solve either one of these problems, could someone please show me the steps?
• Math (Partial) - PsyDAG, Thursday, May 24, 2012 at 10:58am

First Problem

Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions related to the Z scores.

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