mean is 21.6 xi are 6,12,18,24,30,36 fi are 5,4,p,6,4,6 find value of p
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21.6=(558+18p)÷(25+p)
=>540+21.6p=558+18p
=>3.6p=18
=>p=5
=>540+21.6p=558+18p
=>3.6p=18
=>p=5
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