Question: (a) For any grouped data with l classes with group frequencies fi, and class midpoints mi, show that (b) Verify this result for the data

(a) For any grouped data with l classes with group frequencies fi, and class midpoints mi, show that
Улim - )- 0. i=l

(b) Verify this result for the data given in Exercise 1.5.6.

im - )- 0. i=l

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