PLEASE READ THE QUESTION PROPERLY : I have said many times that "DO NOT SEND SIMILAR QUERIES BECAUSE LINK COULD NOT BE OPENED DUE TO SOME TECHNICAL PROBLEM".So Expert Rishabh kindly do not send link.
-Repeating the question:-
"Answer the ICSE board question(2018).
CHAPTER :STATISTICS
(b) If the mean of he following distribution is 24 , find the value of 'a'

M a r k s 0 - 10 10 - 20 20 - 30 30 - 40 40 - 50 N u m b e r   o f   S t u d e n t s 7 a 8 10 5

 

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Here's the answer
Thumbs up if u likes it :)

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I don't think so neetu's answer is correct :|
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What are you looking for?