Question

The average of five integers is 20. The ave of the three middle integers is 8. Wat is the ave. of the first and last integers?

Answer 1

the average of x : \(\langle x\rangle=\frac1N\sum\limits_{i=1}^Nx_i\)

Answer 2

what??? O_O

Answer 3

\[=\frac{x_1+x_2+\cdots+x_N}{N}\]

Answer 4

\[(a+b+c+d+e)=100\]
\[(b+c+d)=24\]
\[a+e=100-24=76\]
\[(a+e)/2=76/2=38\]

Answer 5

i tried 7,8,9,18,18. Not correct.
and also 6,6,12,18,18.

Answer 6

Thanks! :D