Question

the mean of a and b is 8.5 the mean of a, b, c is 7 find the value of c
​

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Answer:

Step-by-step explanation:

We know that,

Mean=sum of all observation/no. Of observation.

8.5=a+b/2

8.5×2=a+b.

17=a+b.

From next part of question

Mean=a+b+c/3

7×3=17+c

21-17=c

Hence, c=4