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Given the set: ${- 1, 6, 4, 11, x, - 7}$ ${-1,6,4,11,x,-7}$ , for what x would the mean of the set be 1?

1 Answer

Dec 26, 2015

$x = - 7$ $x=-7$

Explanation:

By definition, the mean or average of a set of N data points ${X_{i}}$ ${X_i}$ is defined as

$¯ x = \frac{1}{n} n \sum I = 1 x_{i}$ $barx=1/nsum_(I=1)^nx_i$

$therefore 1=1/6(-1+6+4+11+x-7)$

$thereforex=-7$ .

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