Question

The mean of six number 6, 8,5,7 x and 4 is 7 find the value of x?

Answer 1

6+8+5+7+4+x = 30+x
Mean=7
Mean=sum of observations
-------------------------------
no of observations

no of observations= 6

7=30+x
-------
6
7*6=30+x
42= 30+x
42-30=x
12=x

Therefore x=12

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