Question

Problem-9: The monthly income of 9 persons are as given below (in Rs.)
480, 350, 650, 400, 430, 700, 400, 750, 520
calculate the mean by (i) direct method (i) short-cut method and (iii) step-deviation
method.
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Answer 1

Answer:

we cannot use step deviation in this question because in question they shows individual data. if they give discrete frequency or continues we can use step deviation