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.

Answer 1

Answer:

11

Step-by-step explanation:

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

87+a+b+c=120

a+b+c=33

mean of a,b,c is= (a+b+c)/3=33/3=11

hope this will help u

Answer 2

Mean=

= Sum of all values/ number of

values

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

=87+a+b+c/10

12= 87+a+b+c/10

120= 87+a+b+c

120-87 = a+b+c

33=a+b+c

Mean=

Sum of observations/ number of

observations

a+b+c/3

= 33/3

=11

The mean of a b and c is 11.

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