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Byju's Answer
Standard X
Mathematics
Step-Deviation Method of Finding Mean
Find the mean...
Question
Find the mean of the following frequency distribution:
Class
25
−
35
35
−
45
45
−
55
55
−
65
65
−
75
Frequency
6
10
8
12
4
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Solution
Class
Interval
Mean Value
(
x
)
Frequency
(
f
)
f
×
x
25
−
35
30
6
180
35
−
45
40
10
400
45
−
55
50
8
400
55
−
65
60
12
720
65
−
75
70
4
280
Σ
f
=
40
Σ
f
x
=
1980
Mean,
¯
¯
¯
x
=
Σ
f
x
Σ
f
⇒
¯
¯
¯
x
=
1980
40
⇒
¯
¯
¯
x
=
49.5
Hence, the mean is
49.5
.
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Similar questions
Q.
Consider the following frequency distribution:
Class interval :
5 – 10
10 – 15
15 – 25
25 – 45
45 – 75
Frequency :
6
12
10
8
15
To draw a histogram to represent the above frequency distribution the adjusted frequency for the class 25-45 is
(a) 6
(b) 5
(c) 3
(d) 2
Q.
The marks obtained by 110 students in an examination are given below:
Marks:
30 – 35
35 – 40
40 – 45
45 – 50
50 – 55
55 – 60
60 – 65
Frequency:
14
16
28
23
18
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Find the mean marks of the students.
Q.
Find the mean of the following frequency distribution:
Class interval:
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Frequency:
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Q.
Find the mean )arithmetic) of following frequency distribution :
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Find mean
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Step-Deviation Method of Finding Mean
Standard X Mathematics
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