Calculate mean :Class intervals--20-29, 30-39,40-49,50-59,60-69 and frequencies are20,10,6,4 and 5 respectively *
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Step-by-step explanation:
Here the maximum class frequency is 50 and the class corresponding to this frequency is 40-49.
So, the modal class is 40-49.
The lower limit of modal class 40-49 is l = 40.
Class size c = 10
Frequency of the modal class f
1
=50.
Frequency of the class preceding the modal class f
0
=20.
Frequency of the class succeeding the modal class f
2
=30.
z=l+(
2f
1
−f
0
−f
2
f
1
−f
0
)×c
=40+(
2×50−20−30
50−20
)×10
=40+
50
30
×10
=40+6
=46
The mode for the given data is 46.
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