Finding Mean for Grouped Data When Class Intervals Are Not Given
In the freque...
Question
In the frequency distribution of discrete data given below the frequency y against value 0 is missing
Variable (x)
0
1
2
3
4
5
Frequency (f)
y
20
40
40
20
4
If the mean is 2.5 then the missing frequency y will be __________
A
0
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B
1
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C
3
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D
4
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Solution
The correct option is D4 Mean =∑fixi∑fi ⇒0×y+1×20+2×40+3×40+4×20+5×4y+20+40+40+20+4=2.5 ⇒20+80+120+80+20124+y=2.5 ⇒320=2.5(124+y) ⇒320=310+2.5y⇒2.5y=10⇒y=4