Question

If the mean of 1+2+3+x is 10, find x.​

Answer 1

$\frac{6 + x}{4} = 10$

$6 + x = 40$

$x = 34$

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Answer 2

We know,

Mean = ∑x/N

or, 10 = (1+2+3+x)/4

or, 10 = (6+x)/4

or, 10×4 = 6+x

or, 40 = 6+x

or, 40-6 = x

or, 34 = x

or, x = 34 Ans.

I hope this helps.