by what number should-37/75 be divided to get 74/100
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To find the standard deviation of a set of numbers, first find the mean (average) of the set of numbers:
10+15+19+35+27+446=25
Second, for each number in the set, subtract the mean and square the result:
(10−25)2+(15−25)2+(19−25)2+(35−25)2+(27−25)2+(44−25)2=826
Then add all of the squares together and find the mean (average) of the squares, like this:
8266=137.67
Finally, take the square root of the second mean:
137.7−−−−√=11.7.
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