If the mean of the frequency distribution Class : 0-10 10-20 20-30 30-40 40-50 Frequency : 2 3 x 5 4 is 28, then its variance is ________ .

Question

If the mean of the frequency distribution

Class :	$0 - 10$	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$
Frequency :	$2$	$3$	$x$	$5$	$4$

is $28$ , then its variance is ________ .

Correct Answer

151

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