If the mean of $2,9, x+6,2 x+3,5,10,5$ is 7 , then the value of $x$ is :\

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Professor PC Thomas Classes · Answer

(d) : Given mean $=7$\ $	herefore \quad \frac{2+9+x+6+2 x+3+5+10+5}{7}=7$\ $\Rightarrow \frac{40+3 x}{7}=7 \Rightarrow 40+3 x=49$\ $\Rightarrow 3 x=49-40=9 \Rightarrow x=\frac{9}{3}=3$