Question

If the mean of 7, 5, 6, 8, 9, 4, p and 10 is 6, find the value of p.

Answer 1

Answer:

$7 + 5 + 6 + 8 + 9 + 4 + 10 + p = 49 + p \\ \: 49 + p \div 8 = 6 \\ \: 56 = 49 + p \\ 56 - 49 = p \\ p = 7$