What is the mean of $13 a n d 27$ ?

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Solution

Finding the arithmetic mean:
$A r i t h m e t i c m e a n = \frac{S u m o f a l l o b s e r v a t i o n}{t o t a l n u m b e r o f o b s e r v a t i o n}$
The arithmetic means of $13 a n d 27 i s = \frac{13 + 27}{2}$
$= \frac{40}{2} = 20 .$
Hence, the arithmetic means of $13 a n d 27 i s 20$ .

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I think of a number and on adding 13 to it, I get 27. Equation for this is

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Question 23

I think of a number and on adding 13 to it, I get 27. Equation for this is

(a) x - 27 = 13

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$x$	$19$	$21$	$23$	$25$	$27$	$29$	$31$
$f$	$13$	$15$	$16$	$18$	$16$	$15$	$13$

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