Question:
If the mean of the following data is 15, find p.
Solution:
It is given that,
Mean = 15
$\Rightarrow \sum f x / N=15$
⇒10p + 445p + 27=15
⇒10p + 445 = 15 × (p + 27)
⇒ 10p + 445 = 15p + 405
⇒15p − 10p = 445 − 405
⇒ 5p = 40
⇒ p = 405 = 8
⇒ p = 8
∴ p = 8.
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