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Question

Find the missing value of p for the following distribution whose mean is 12.58.

x:581012p2025f:25822742


A

12

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B

16

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C

14

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D

15

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Solution

The correct option is D

15


Mean=12.58

xifixi×fi52108540108801222264p77p2048025250Total50524+7p

Mean (¯x)=fixifi12.58=524+7p50629=524+7p7p=629524=105p=1057=15 p=15


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