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Standard IX

Mathematics

Average

A student was...

Question

A student was asked to find the average of the following $12$ numbers : $3, 11, 7, 9, 15, 13, 8, 19, 17, 21, 14 a n d x .$ He found the average to be $12$ . What should come in place of x?

3

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7

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17

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31

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Solution

The correct option is A $7$
$\frac{3 + 11 + 7 + 9 + 15 + 13 + 8 + 19 + 17 + 21 + 14 + x}{12} = 12 \Rightarrow 137 + x = 144 \Rightarrow x = 7$

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A student was asked to find the average of the following 12 numbers :3,11,7,9,15,13,8,19,17,21,14 and x. He found the average to be 12. What should come in place of x?

The correct option is A 73+11+7+9+15+13+8+19+17+21+14+x12=12⇒137+x=144⇒x=7

A student was asked to find the average of the following $12$ numbers : $3, 11, 7, 9, 15, 13, 8, 19, 17, 21, 14 a n d x .$ He found the average to be $12$ . What should come in place of x?

The correct option is A $7$
$\frac{3 + 11 + 7 + 9 + 15 + 13 + 8 + 19 + 17 + 21 + 14 + x}{12} = 12 \Rightarrow 137 + x = 144 \Rightarrow x = 7$