The mean of $x + 3, x - 2, x - 1$ is $10$ find x

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Solution

The data is $x + 3, x - 2, x - 1$
The sum of data is $x + 3 + x - 2 + x - 1 = 3 x$
The mean is $10 = \frac{3 x}{3} x = 10$

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Q. Question 12
If the mean of the observations x, x+3, x+5, x+7 and x+10 is 9, then mean of the last three observation is:

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10 \frac{2}{3}

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The mean of x+3,x−2,x−1 is 10 find x

The data is x+3,x−2,x−1The sum of data is x+3+x−2+x−1=3xThe mean is 10=3x3x=10

The mean of $x + 3, x - 2, x - 1$ is $10$ find x

The data is $x + 3, x - 2, x - 1$
The sum of data is $x + 3 + x - 2 + x - 1 = 3 x$
The mean is $10 = \frac{3 x}{3} x = 10$