Question

The arithmetic mean of a set of 7 numbers is 84. After three of the numbers are dropped from the list, the average of the remaining numbers is 56. What is the average of the numbers that were dropped?

Answer 1

That's a nice problem!

Answer 2

The sum of the 4 remaining numbers is 4 x 56. OK?

Answer 3

ok

Answer 4

and thanks, if u say so that it's a nice problem :)

Answer 5

then what?

Answer 6

224

Answer 7

Right, and the sum of all 7 numbers is 7 * 84 = x.
What you want is (x - 224) / 3
Do you see why?

Answer 8

yea

Answer 9

I got it, thanks :) Can u help me with 2 more questions?

Answer 10

?

Answer 11

back

Answer 12

can u help me with 2 more?

Answer 13

try

Answer 14

I'll post new question on the left

Answer 15

OK