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'