Question

Find the mean of the following frequency distribution.

Answer 1

$\huge \bf\textbf{\textsf{ \color{navy}\underline{\color{red}Solution} : }}$

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To get the Class marks, the Formula is :

$\displaystyle \color{navy}{⇝} \: \: \color{magenta}{ \: \boxed{ \bf Class \: marks \: = \: \frac{Upper \: Class \: limit + Lower \: class \: limit}{2}}}$

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♣️ Mean Formula :

$\large\displaystyle \red{ ⟼ \: \: \boxed{ \bf\overline x \: = \: \frac{Σ \: f_{i} \: x _{i} }{Σ \: x _{i}} }}$

Where,

$\red{⇢ } \: \sf \: f _{i} \: = \: \bf Number \: of \: frequency$

$\sf \red{⇢} \: x_{i} \: = \bf \: Class \: marks$

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Refer the above attachment ⤴

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