Question

for given data if mean is equal to 8 and N is equal to 15 then fixi​

Answer 1

SOLUTION

GIVEN

For given data if mean is equal to 8 and N is equal to 15

TO DETERMINE

The value of $\sf{ \sum \: f_i x_i}$

EVALUATION

Here it is given that for given data if mean is equal to 8 and N is equal to 15

$\displaystyle \sf{Mean = \frac{ \sum \: f_i x_i}{ \sum \: f_i } }$

$\displaystyle \sf{ \implies \: Mean = \frac{ \sum \: f_i x_i}{N } }$

$\displaystyle \sf{ \implies \:8 = \frac{ \sum \: f_i x_i}{15 } }$

$\displaystyle \sf{ \implies \:\sum \: f_i x_i = 15 \times 8 }$

$\displaystyle \sf{ \implies \:\sum \: f_i x_i = 120}$

FINAL ANSWER

$\boxed{ \: \: \displaystyle \sf{\:\sum \: f_i x_i = 120} \: \: }$

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