1.

If the mean x, x+3, x+6,x+9 and x+12 is 10 then x is

Answer»

Value \:of\: X = 4

Step-by-step EXPLANATION:

Given \: observations \:are \:\\x,x+3,x+6,x+9 \: and \: x+12 \: is \: 10

\BOXED {MEAN(x)=\frac{Sum\:of\: observations}{Number \: of \: observations}}

Mean=10

\implies \frac{x+x+3++x+6+x+9+x+12}{5}=10

\implies \frac{5x+30}{5}=10

\implies \frac{5(x+6)}{5}=10

\implies x+6=10

\implies x = 10-6

\implies x = 4

Therefore,

Value \:of\: x = 4



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