Question

the mean of 8,10,x+2,14,3x -2 and 7 is 12 find the value of x​

Answer 1

mean = 12

mean = sum of observations / no of observations

12 = 8 + 10 + x + 2 + 14 + 3x -2 + 7 / 6

12 = 39 - 3x / 6

12 * 6 = 39 -3x

72 = 39 - 3x

72 - 39 = 3x

33 = 3x

3x = 33

x = 33/3

x = 11

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