1.

The mean of the following distribution is 50. Find the value of a and hence the frequencies of 30 and 70.

Answer» Correct Answer - a=5, `f_(30)=28,f_(70) =24`
` (170+30(5a+3) +1600 +70 (7a -11) +1710)/(60 +12a) =50`
` Rightarrow = 64a +2800 = 3000 +600a Rightarrow 40a = 200 Rightarrow a=5`


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