Obtain the mean of the following data.
$x$ $5$ $10$ $15$ $20$ $25$
$f$ $3$ $10$ $25$ $7$ $5$

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Solution

$x$ $f$ $f x$
$5$
$10$
$15$
$20$
$25$ $3$
$10$
$25$
$7$
$5$ $15$
$100$
$375$
$140$
$125$
Total $\sum f = 50$ $\sum f (x) = 755$
Mean $= \frac{\sum f (x)}{\sum f} = \frac{755}{50} = 15.1$
Mean $= 15.1$

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$C I$	$5 - 10$	$10 - 15$	$15 - 20$	$20 - 25$	$25 - 30$
$f$	$5$	$12$	$3$	$11$	$9$

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$x$	$10$	$15$	$p$	$25$	$35$
$f$	$3$	$10$	$25$	$7$	$5$

x	$5$	$10$	$15$	$20$	$25$	$30$
f	$4$	$5$	$7$	$4$	$3$	$2$

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k

$x$ :	$5$	$10$	$15$	$20$	$25$
$f$ :	$7$	$k$	$8$	$4$	$5$

Class	$0 - 5$	$5 - 10$	$10 - 15$	$15 - 20$	$20 - 25$	$25 - 30$
Frequency	$4$	$5$	$7$	$12$	$7$	$5$

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