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anonymous
 one year ago
WILL FAN AND MEDAL
The grades on the last art exam had a mean of 75%. Assume the population of grades on art exams is known to be distributed normally, with a standard deviation of 7%. Approximately what percent of students earn a score between 75% and 82%?
37.2%
84.1%
34.1%
50%
anonymous
 one year ago
WILL FAN AND MEDAL The grades on the last art exam had a mean of 75%. Assume the population of grades on art exams is known to be distributed normally, with a standard deviation of 7%. Approximately what percent of students earn a score between 75% and 82%? 37.2% 84.1% 34.1% 50%

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Hayleymeyer
 one year ago
Best ResponseYou've already chosen the best response.0ohh snap, these problems! X_X

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I know that i need to use the zScore formula, But now when it says "between %75 and %82" ZSCORE = \[z= \frac{ \mu  x }{ }\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0whoops theres supposed to be a sigma under that

Hayleymeyer
 one year ago
Best ResponseYou've already chosen the best response.0@pooja195 help please? im not very good with this stuff! :)

Hayleymeyer
 one year ago
Best ResponseYou've already chosen the best response.0yay!! help has arrived!

Luigi0210
 one year ago
Best ResponseYou've already chosen the best response.0Don't know much stats, sorryy @imqwerty

Hayleymeyer
 one year ago
Best ResponseYou've already chosen the best response.0qwerty, you better help this kid! :)

imqwerty
 one year ago
Best ResponseYou've already chosen the best response.0damn this is statistics!!!

Hayleymeyer
 one year ago
Best ResponseYou've already chosen the best response.0@graysongraddylol do you still need help? :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yes I do @Hayleymeyer

Hayleymeyer
 one year ago
Best ResponseYou've already chosen the best response.0okay, ima find you some help, cuz you seem nice

phi
 one year ago
Best ResponseYou've already chosen the best response.0mean of 75%. standard deviation of 7% score between 75% and 82%? (it is a bit confusing because our measurements are percents (on a test)... and we also have percent (under a curve) ) but we want the area under the bell curve from 75% (the mean) and 82% (which is 1 std dev to the right of the curve) how much area is between the mean and 1 std dev from the mean do you know how to figure that out ?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i have no clue what a standard deviation is :(

Hayleymeyer
 one year ago
Best ResponseYou've already chosen the best response.0yay! you got help!!

phi
 one year ago
Best ResponseYou've already chosen the best response.0do you know what a bell curve looks like?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Like this.? dw:1440706033076:dw

phi
 one year ago
Best ResponseYou've already chosen the best response.0yes. and its symmetric (left side looks like right side) the exact middle is the mean

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1440706112012:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1440706140992:dw

phi
 one year ago
Best ResponseYou've already chosen the best response.0the idea is the "area under the curve" is set = to one btw, in theory the "tails" never reach the xaxis half of the area is below the mean, and 1/2 of the area is above the mean

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Can't I solve this using the zscore formula.?

phi
 one year ago
Best ResponseYou've already chosen the best response.0yes, we use zscores. But you need to get the basic ideas so far, you know (for example) dw:1440706289865:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0A friend of mine just told me it was 34.1% is that correct.?

phi
 one year ago
Best ResponseYou've already chosen the best response.0a "standard deviation" is a way to measure how far we are away from the mean you should memorize the area from 1 std dev (below the mean) to 1 std dev (above the mean) is 68.27% of the entire area

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0That is the emperical rule, Correct.?

phi
 one year ago
Best ResponseYou've already chosen the best response.0in other words, you should know this dw:1440706585153:dw

phi
 one year ago
Best ResponseYou've already chosen the best response.0there is a mathematical definition of the curve, and you can calculate the area. In the real world, measurements (for example, height of people), will form an almost perfect bell curve, and we can use the math to closely model the real world. back to your problem 75 is the mean 82 is 1 std dev above the mean we want this area dw:1440706762063:dw

phi
 one year ago
Best ResponseYou've already chosen the best response.0you are told the area from 1 to +1 is 68.27% your know the area is symmetric about the mean (in other words, 1/2 of that 68.27 is on the left side and 1/2 is on the right side of the mean) that is enough info to figure out how much area is from 0 to 1 (it's 1/2 of the area from 1 to 1)
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