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The following distribution shows the daily pocket allowance of children of a locality. The mean pocket allowance is Rs 18. Find the missing frequency f. Daily Pocket Allowance(in c) 11-13 13-15 15-17 17-19 19-21 21-23 23-35 Number of children 7 6 9 13 f 5 4

Posted by Gouri Yaswanth Kumar 4 years, 4 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 4 years, 4 months ago

Lets take assumed mean, A as 16

Class interval =2

∴ui=hxi−A=2xi−16

Now, we have A=16,xˉ=18 and h=2

We know that,

Mean, xˉ=A+h(N1∑fiui)

⇒18=16+2(f+442f+24)

⇒f+442f+24=1

⇒f+44=2f+24

⇒f=20

Hence, the value of missing frequency, f=20

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