plz do i have given ans also plz do explaination
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Answer:
FX sum = 190+30(5a+3)+50*32+70(7a-11)+90*19 = 2780+150a+90+490a-770
= 2800+640a
now mean = FX/x
putting value ,
(2800+640a)/(60+12a) = 50
2800+640a = 3000+600a
40a = 200
a = 5
frequency of 30 = 5*5+3 = 28
Frequency of 70 = (7*5-11) = 24 (Ans)
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