87. A score is 20.
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As a score is 20 years, 4 score and 7 years equals 87 years.
Standard deviation is the square root of the mean. The mean for this set is (2 + 4 + 3 + 7)/4 = 16/4 = 4; the square root of this is 2.
9;9;9 Mean = sum of scores / number of scores = 9+9+9 / 3 = 27 / 3 = 9 another example is 7, 9, 11 8, 9, 10 etc even: 7, 8, 12
The mean is the arithmetic average. The average of 4 9 7 4 & 1 is 5
7.