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zarkam21 (zarkam21):
The mean of 100 numerical observations is 47.8. What is the value of the sum of all 100 numbers?
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OpenStudy (anonymous):
Not sure this is the right section, but you find the mean, or average, by finding the sum and dividing by however many numbers you added. So for this problem... \[\frac{ n_{1}+n_{2}+...n_{100}}{ 100 }=47.8\] Since you only want to know the sum, not the individual numbers added, you just have to solve for the numerator.
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