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
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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
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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