Maths / Statistics / Mean of Ungrouped Data

QUESTION
 

Find the mean of the following distribution : 

Class Marks515253545
Frequency81210119

 

EXPLANATION
Explain TypeExplanation Content
Text

Direct method is generally used for calculating the mean. 

Class marks (x_i)Frequency (f_i)f_ix_i
5840
1512180
2510250
3511385
459405
 501260

Mean = frac {sum f_ix_i}{sum f_i}

               =frac {1260}{50}

              =25.2

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