Question

if 7 is the mean of 3,5,8,p, then p=?​

Answer 1

Answer:

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Step-by-step explanation:

$Since \: \: 7 \: \: is \: \: the \: \: mean \: \: of \: \: 3, 5, 8, p \\ Therefore, \frac{3 + 5 + 8 + p}{4} = 7 \\ 3 + 5 +8 + p = 7 \times 4 = \\ 16 + p = 28 \\ p = 28 - 16 \\ p = 12$