Numericals based on Missing frequency

Missing frequency


Find out the missing frequency (frequencies) of following series:-
mean is 52 find missing f
Marks:
10-20
20-30
30-40
40-50
50-60
60-70
70-80
No. of students:
5
3
4
F
2
6
13
(Sol:-7)
A.M is 35 and total number of items is 100,find f1 and f2
C.I
0-10
10-20
20-30
30-40
40-50
50-60
60-70
Frequency:
5
10
f1
4
20
3
f2
(sol.:-f1=41(app); f2=17(app))
The numbers 3.2, 5.8, 7.9 and 4.5 have frequencies X, (X+2), (X-3) and (X+6) respectively. If the arithmetic mean is 4.876, find the value of X.
(Sol: - 5)
Find the missing frequency from the following data if average mark is 16.82
Marks:
0-5
5-10
10-15
15-20
20-25
25-30
30-35
Frequency:
10
12
16
-
14
10
8
(Sol:-18)
5.)
Find missing frequency if mean = 1.46
No. of accidents:
0
1
2
3
4
5
Frequency:
46
-
-
25
10
5
(sol.:- f1=76 and f2= 38)
mean = 47.2 find out missing frequency
Weekly wages(Rs.)
40-43
43-46
46-49
49-52
52-55
Frequency:
31
58
60
F1
27
(Sol: - 44)

Student of Rai Business School- New Delhi

Sanjeev Kumar Singh