Find the missing frequencies — task. Mathematics CBSE, Class 10.

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If the mean of the following distribution is 50, and the sum of all the frequencies is 40, then find the value of the frequencies

$a$ and

$b$ .

Class interval	$20 - 30$	$30 - 40$	$40 - 50$	$50 - 60$	$60 - 70$	$70 - 80$
Frequency	6	$a$	6	5	$b$	2

The value of the frequency

$a$ is .

The value of the frequency

$b$ is .

$1$

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4. Find the missing frequencies