Question

50) If the mean of the following data is 1.75, then find the value of p.

X 10 15 p 25 30

f 5 10 7 8 2

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Answer 1

$1.75 = \frac{10 + 15 + p + 25 + 30}{5 + 10 +7 + 8 + 2 } \\ 1.75 = \frac{80 +p }{32} \\ 1.75 \times 32 = 80 + p \\ 540= 80 + p \\ 540 - 80 = p \\ p = 460$