Find the value of the variable "a" — task. Mathematics CBSE, Class 10.

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Answer variants:

Determine the value of "

$a$ " if the mean of the following data is 15.

Class interval	$5 - 10$	$10 - 15$	$15 - 20$	$20 - 25$	$25 - 30$	$30 - 35$
Frequency	8	9	4	$a$	2	1

The value of the variable is

$1$

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8. Find the value of the variable "a"