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Question

Find the missing frequency p in the following frequency distribution whose mean is 28.25
x152025303540f87p14156


A

10

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B

12

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C

15

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D

2

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Solution

The correct option is A

10


xifixi×fi15812020714025p25p30144203515525406240Total50+p1445+25p

Mean, ¯x=fixifi28.25=1445+25p50+p1445+25p=1412.5+28.25p3.25p=32.5p=10


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