Find the mean of the following frequency distribution.
x 10 15 30 25 42 21 11
f 5 2 6 4 3 8 2

21 \frac{8}{15}

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22 \frac{8}{15}

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23 \frac{8}{15}

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19 \frac{8}{15}

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Solution

The correct option is B $22 \frac{8}{15}$
Mean= $\frac{\sum f x}{\sum f} = \frac{676}{30} = 22 \frac{8}{15}$

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Similar questions

Class	0-50	50-100	100-150	150-200	200-250	250-300	300-350
Frequency	$10$	$15$	$30$	$20$	$15$	$8$	$2$

Class interval	$10 - 15$	$15 - 20$	$20 - 25$	$25 - 30$
Frequency	$7$	$12$	$8$	$10$

15

p

Variable $(x_{i})$	$10$	$12$	$14$	$16$	$18$
Frequency $(f_{i})$	$13$	$p$	$15$	$32$	$28$

15

a

Class Interval	$5$	$10$	$15$	$20$	$25$
Frequency	$6$	$a$	$6$	$10$	$5$

Class interval	$10 - 15$	$15 - 20$	$20 - 25$	$25 - 30$	$30 - 35$
Frequency	$8$	$11$	$6$	$13$	$12$

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