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anonymous
 one year ago
The scores on an exam are normally distributed, with a mean of 85 and a standard deviation of 5. What percent of the scores are from 85 to 95?
anonymous
 one year ago
The scores on an exam are normally distributed, with a mean of 85 and a standard deviation of 5. What percent of the scores are from 85 to 95?

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Have you seen this before? http://img.tfd.com/mk/D/X2604D41.png

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0but im just confused on how it works

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0basically it shows how much of the data is within so many standard deviations of the means. Your mean is 85, that's 0 deviations away. The standard deviation is 5, so 95 would be 2 standard deviations away. Does that make sense?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0uh well im not really sure what a standard deviation is to be honest

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0it's a measure of how spread out the data is. If it's small, then a lot of the scores would be really close to the mean. If it's big, then the data is more spread out

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so the data in this case would be spread out by 5

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0sort of. the graph up above only works for normal distributions, meaning most of the data is falls within 5 points of the mean. Specifically 68%

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1435969260712:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0If we were to label the graph with numbers from your problem 85 would go in the middle because that's the mean

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0since the standard deviation is 5, you can add labels to the right increasing by 5 and labels to the left decreasing by 5

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so to the the percentage from 85 to 95 you just add 34 and 13?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0cool i got it! thank you so much!!
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