Brianna has the test scores: 90, 90, 91, 89, 91, 89, 90, 90. (Just you you dont have to waste time on your work: mean is 90) What is her mean deviation, variation, and standard variation?

Question

anonymous · Answer

standard variation or deviation?

anonymous · Answer

both

anonymous · Answer

so u need to find out mean deviation, variation, and standard variation and standard deviation?

hero · Answer

Are you serious? I thought this was hard, lol

anonymous · Answer

yes

anonymous · Answer

hero the genius:P

anonymous · Answer

im just starting this section, and idk if im right on most of m answers

hero · Answer

I thought you posted a calc question or something

anonymous · Answer

i dunno anything bout this... just typed into google to see wat it was... sorry! i can't answer:(

anonymous · Answer

no, just deviations

anonymous · Answer

can you help?

anonymous · Answer

google wat each thing like deviation n stuff means jiwani... then try to use ur understanding to solve the question... that is unless no one knows how to solve this

anonymous · Answer

n if u still don't get it, ask ur teachers... good luck wif solving! bye:P

anonymous · Answer

well... i think i got it, but im not sure

anonymous · Answer

haha came here for a few sec... got it alrd jiwani?

anonymous · Answer

$$\sigma = {\[\sigm\[a = \sqrt{\Sigma}(x-mean)^2\div n$$

anonymous · Answer

Thats to calculate the standard deviation or you can use your calculator by using the stat mode enter all the values as 'X' values and calc std deviation. Standard Deviation = 0.71..Variance =0.50 and the mean deviation is ( mean - Std. deviation; mean+ Std. deviation ) = 90-0.71; 90+0.71