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Unformatted text preview: B
C
D
E
F
G
Income(in 30
70
60
100
200
150
300
rupees)
Calculate the arithmetic average by
(a)Direct method and (b)Shortcut method
27.
Calculate the mean for the data
X:
5
8
12
15
20
24
f:
3
4
6
5
3
2
136 28. The following table gives the distribution of the number of
workers according to the weekly wage in a company.
Weekly wage
(in Rs.100’ s)
Numbers of
workers
4050 010 1020 2030 3040 5 10 15 18 5060 6070 7080 7
8
5
3
Obtain the mean weekly wage.
29.
Mean of 20 values is 45. If one of these values is to be taken
64 instead of 46, find the corrected mean (ans:44.1)
30.
From the following data, find the missing frequency when
mean is 15.38
Size :
10
12
14
16
18
20
Frequency: 3
7
__
20
8
5
31.
The following table gives the weekly wages in rupees of
workers in a certain commercial organization. The
frequency of the classinterval 4952 is missing.
4043
4346
4649
4952
5255
Weekly
wages (in
rs) :
31
58
60
__
27
Number
of
workers
It is known that the mean of the above frequency
distribution is Rs .47.2. Find the missing frequency.
32.
Find combined mean from the following data
X1 = 210
n1=50
X2 = 150
n2 =100
33.
Find combined mean from the following data
Group
1
2
3
Number
200
250
300
Mean
25
10
15
137 34. 35. 36. Average monthly production of a certain factory for the first
9 months is 2584, and for remaining three months it is 2416
units. Calculate average monthly production for the year.
The marks of a student in written and oral tests in subjects
A, B and C are as follows. The written test marks are out of
75 and the oral test marks are out of 25. Find the weighted
mean of the marks in written test taking the marks in oral
test as weight. The marks of written test and oral test
respectively as follows: 27, 24, 43 and 5, 10, 15.
The monthly income of 8 families is given below. Find GM. Family :
Income(Rs)
37. A
70 B
10 C
500 D
75 E
8 F
250 G
8 H
42 The following table gives the diameters of screws obtained
in a sample inquiry. Calculate the mean diameter using
geometric average. Diameter(m.m)
No. of. Screws 130
3 13...
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 Winter '08
 Moshiri
 Business

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