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Likurg_2 [28]
3 years ago
6

: the variance of a series of numbers is the sum of the squares of their differences from the mean (average) of the numbers divi

ded by the number of items in the series. variance is a common measure of risk. what is the variance of these investment returns? 10, 30, 20
Mathematics
1 answer:
enot [183]3 years ago
7 0
The given data; 10,30,20
The mean will be (10+30+20)/3 = 20
Deviation from the mean will be; -10, 10, 0
Square of the deviations will be; 100, 100, 0 
The sum of the square of the deviations = 200
The variance will therefore be; sum of the square of deviations from the mean divided by the N (3)
 = 200/3 = 66.67
Thus; the variance = 66.67
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