The H.M. of following frequency distribution is
$x_{i}$ 3 6 9 12
$f_{i}$ 1 2 3 4

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7.5

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None of these

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Solution

The correct option is C 7.5
H.M of the given distribution is $= \frac{\sum f_{i}}{\sum \frac{f_{i}}{x_{i}}} = \frac{1 + 2 + 3 + 4}{\frac{1}{3} + \frac{2}{6} + \frac{3}{9} + \frac{4}{12}} = \frac{10}{\frac{4}{3}} = \frac{30}{4} = 7.5$

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Similar questions

$x_{i}$	3	6	9	12
$f_{i}$	1	2	3	4

2.6

$x_{i}$	1	2	3	4	5
$f_{i}$	5	4	f	2	3

$x_{i}$	3	6	10	12	7	15
$f_{i}$	3	4	2	8	13	10

5

b

$x_{i}$ :	3	5	7	4
$f_{i}$ :	2	$a$	5	$b$

2.6

$x_{i}$	$1$	$2$	$3$	$4$	$5$
$f_{i}$	$5$	$4$	$f$	$2$	$3$

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