if the mean of the following frequency distribution is 26.7 find the missing frequency f
Answers
Answer: f=10
Step-by-step explanation:
Given : Mean & frequency distribution
To find : Missing Frequency
Solution:
Observation Frequency observation * frequency
15 4 15 * 4 = 60
20 8 20 * 8 = 160
25 18 25 * 18 = 450
30 f 30 * f = 30f
35 7 35 * 7 = 245
40 3 40 * 3 = 120
TOTAL 40 + f 785 + 30f
Mean = (1035 + 30f)/(40 + f)
=> 26.7 = (1035 + 30f)/(40 + f)
=> 1068 + 26.7f = 1035 + 30f
=> 33 = 3.3 f
=> f = 10
Missing frequency = 10
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