Find the missing frequency p for the following frequency distribution whose mean is 28.25.

x f

15 8

20 7

25 p

30 14

35 15

40 6

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Uploaded: 2022-01-05T06:16:12+00:00
Description: R S Aggarwal Solutions - Mathematics - Class 9 Mean Median And Mode Of Ungrouped Data Mean Median And Mode Of Ungrouped Data Exercise 18B solutions written by Lido's expert teachers

Question

Find the missing frequency p for the following frequency distribution whose mean is 2825

Accepted Answer

It is given that Mean 2825 We know that Mean fi xi fi So we get 1445 25p 50 p 2825 On further calculation 1445 25p 141250 2825p So we get 2825p 25p 1445 141250 It can be written as 325p 325 By division p 10 Therefore the value of p is 10

x	f	xifi
15	8	120
20	7	140
25	p	25p
30	14	420
35	15	525
40	6	240
	Σ fi = 50 + p	Σ fi xi = 1445 + 25p

RS Aggarwal Solutions Class 9 Mathematics Solutions for Mean Median And Mode Of Ungrouped Data Exercise 18B in Chapter 18 - Mean Median And Mode Of Ungrouped Data