Question

The mean of 16,12,8,p,11,10,and 9 is 12 find the value of 'p,

Answer 1

(16+12+8+p+11+10+9)/7=12

⇒66+p=84

⇒p=84-66

⇒p=18

Answer 2

we know, mean = sum of observations/total number of observations

here observations are : 16, 12, 8, p, 11, 10, 9
sum of observations = (16 + 12 + 8 + p + 11 + 10 + 9)
= (66 + p)
total number of observations = 7

so, mean = (66 + p)/7 = 12
66 + p = 12 × 7
p = 84 - 66 = 18

hence, value of p = 18