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The mean of following distribution is 50,find the valu of b and hence find the frequency of 30& 70 x =10,30,50,70,90 f = 17,(5b+3),32,(7b-11),19



For frequency put B value. u will get the frequency. I m unable to upload pic. but the B value is 5. put the formula 50=sum of xy/ sum of y 50=640b+2800/12b+60 600b+3000=640b+2800 40b=200 b=200/40=5
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