Math Is Fun Forum

stormswimmer

Member

Registered: 2006-01-27

Posts: 8

Statistics

Can Someone HELP!!!!

the average score for a standized test is 500 with a standard deviation of 100. If each score is increaced by 25, what is the new mean and standard deviation

fgarb

Member

Registered: 2006-03-03

Posts: 89

Re: Statistics

Hi stormswimmer,

Rather than giving away the answer straight off I'm going to try and guide your thinking. Please ask again if you still need more help after this or if you want us to check your thinking.

First think about what the mean and standard deviation really mean outside of any math. The mean is an average of a bunch of numbers, and the standard deviation represents how spread out the numbers are. So if you added 25 to every number, how much do you think the average of those numbers should change by? And will they become more or less spread out than they were before?