Question

the mean of x1, x2 is 6 and mean of x1, x2, x3 is 7. The value of x3 is ____ ?

Answer 1

Mean of x1 + x2 = 6
So,
(x1 + x2)/2 = 6----[ Mean Fromula ]
x1 + x2 = 12

Substituting The Value Of Sum Of x1 and x2 in The Below Equation

(x1 + x2 + x3) / 3  = 7
(7 +  x3) = 7 * 3
7 + x3 = 21
x3 = 21 / 7
x3 = 3

Ans = Value of x3 = 3

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