The mean of $18, 24, 15, 2 x + 1$ and $12$ is $21$ , then the value of $x .$ is

17.5

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Solution

The correct option is A $17.5$
mean of $18, 24, 15, 2 x + 1, 12$ is $21$

Mean = $\frac{S u m}{N u m b e r o f o b s e r v a t i o n s}$

Mean = $\frac{18 + 24 + 15 + 2 x + 1 + 12}{5} = 21$

$70 + 2 x = 105$

$2 x = 35$

$x = 17.5$

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The mean of 18,24,15,2x+1 and 12 is 21, then the value of x. is

The correct option is A 17.5mean of 18,24,15,2x+1,12 is 21Mean = SumNumberofobservationsMean = 18+24+15+2x+1+125=2170+2x=1052x=35x=17.5

The mean of $18, 24, 15, 2 x + 1$ and $12$ is $21$ , then the value of $x .$ is

The correct option is A $17.5$
mean of $18, 24, 15, 2 x + 1, 12$ is $21$

Mean = $\frac{S u m}{N u m b e r o f o b s e r v a t i o n s}$

Mean = $\frac{18 + 24 + 15 + 2 x + 1 + 12}{5} = 21$

$70 + 2 x = 105$

$2 x = 35$

$x = 17.5$