Q. For the following frequency distribution value of Q2 is 22, find the missing frequency.
Class ----Frequency
0-10 ------- 5
10-20 -------8
20-30 -------?
30-40 -------4
40-50 ----_-3
Answers
Answered by
1
Answer:
X = 12
Step-by-step explanation:
Solution -
C.I |0-10 |10-20 | 20-30 |30-40 | 40-50
Frequency |8 | X | 10 | 11 | 9.
Midvalue5 | 5 | 15 | 25 | 35 | 45
Mean = 25.2
8×5+15x+10×25+11×35+9×45=25.2
--------------------------------------------------
8+x+10+11+9
1080+15x=957.6+25.2x
x=10.2122.4
x=12.
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