Question

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

Answer 1

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

Answer 2

Hi there!

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What is Mean?

The average of a given set of numbers is called the Arithmetic mean, or simply the mean, of the given numbers.

Mean = $\frac{Sum \: of \: observations }{Number \: of \: observations }$

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For your solution to the given question refer to the attachment.

Thanks for the question!

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