Posted by Laynette on Friday, August 26, 2011 at 10:04pm.
1) 300 is two deviations of 50 away from 200, so the standard score is 2.
2) You need to look at a normal distribution for this. A quick google search should help you just fine. Or, possibly, you were provided one in class.
From such a table, you can see that being two deviations away from the middle amounts to 34.13% + 13.59% = 47.72%
3) You just take 47.72% 9which is the distance from the middle to 300) and add 50% (which is everyone below the middle). You get 97.72%
1. Z (a standard score) = (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.
Percentile rank is the proportion below or equal to a particular score.
Related Questions
stats - A set of data is normally distributed with a mean of 200 and standard ...
statistics - The mean of a normally distributed data set is 226.2. The data item...
statistics - A set of data is normally distributed with a mean of 98 and a ...
statistics - if the mean of a normally distributed set of data is 100 and the ...
Statistics - I am so lost on this statistics question would someone help me ...
statistics - The scores on a national achievement test are normally distributed ...
statistics - cost of producing is 50 cents each and they sell for 1.25 each. ...
Math - The mean of a set of normally distributed data is 550 and the standard ...
college statistics - a set of data is normally distributed with a mean of 1000 ...
statistics - The actual weights of bag of pet food are normally distributed.The ...
For Further Reading
