Question

If mean of 15, 8, 12, a, b, c, 20, 6, 17 and 9 is 12 then find the mean of a, b and c.
Options
a:10
b:11
c:12
d:13​

Answer 1

Answer:

B 11

15+8+12+a+b+c+20+6+17+9 = 87+a+b+c /10

Step-by-step explanation:

87+a+b+c= 12x10

a+b+c= 120-87

= 33

avg = 33/3

= 11