If the means of two distributions are M 1 and M 2 , while their respective frequencies are f 1 and f 2 , then the combined mean of the two distributions will be

Correct Answer is : M1f1+M2f2f1+f2

{M_{1} + M_{2}}/{f_{1} + f_{2}}

{M_{1}f_{1} + M_{2}f_{2}}/{f_{1} + f_{2}}

{M_{1}f_{1} + M_{2}f_{2}}/{M_{1} + M_{2}}

Tripura TET Math Science 2017 Solved Paper

Question : 97 of 150

Marks: +1, -0

If the means of two distributions are M₁ and M₂, while their respective frequencies are f₁ and f₂, then the combined mean of the two distributions will be

$\;{M_{1}\;+\;M_{2}}/{f_{1} + f_{2}}$
$\;{M_{1}f_{1}\;+\;M_{2}f_{2}}/{f_{1} + f_{2}}$
$\;{M_{1}f_{1}\;+\;M_{2}f_{2}}/{M_{1} + M_{2}}$
None of the above

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