Question

Hola guys!!!!! Anyone please explain me how to find mean with sigma sign!!!!!!!!!!

Answer 1

sigma is a greek letter .sigma is addition version of factorial.

Answer 2

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Please consider attached for the Answer

In grouped Frequency

>> mean = sum of numbers divided by No. of numbers

= $\huge{\dfrac{ {\sum\limits_{i=1}^{n} x_i}}{n}}$

In ungrouped frequency

>> mean = Sum of (frequency × No.) divided by Sum of frequency

= $\huge{\dfrac{ {\sum\limits_{i=1}^{n} x_i \times f_i}}{{\sum\limits_{i=1}^{n} f_i}}}$