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How do you find an unknown number if you have every other number and the mean?
Wiki User
∙ 14y ago
Let's have a simple example.
If the elements of a set are 3, 8, 11, x, and 32, and their mean is 15, find the value of x.
Solution
mean = the sum of all the element values/the total number of elements
15 = (3 + 8 + 11 + x + 32)/5
15 = (54 + x)/5 multiply both sides by 5
75 = 54 + x subtract 54 from both sides
21 = x
Thus, the missing number is 21.
Wiki User
∙ 14y ago
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