Question

if the mean of the following distribution is 54, find the value of P. class=0-20,20-40,40-60,60-80,80-100.frequency =7,p,10,9,13.​

Answer 1

$m \: = \: \frac{fx}{n}$

$54 = \frac{2370 + 30p}{39 + p}$

$2106 + 54p = 2370 + 30p$

$54p - 30p = 2370 - 2106$

$24p = 264$

$p = \frac{264}{24}$

$p = 11$

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