+0

0
65
1

Suppose we have a bag with 10 slips of paper in it. Eight slips have a 3 on them and the other two have a 9 on them.

How many 's do we have to add to make the expected value equal to 6?

Mar 7, 2022

#1
+1382
+1

I will assume the question is supposed to be a 9.

We can write as equation:

$$3 \times 8 + 9 \times 2 + 9x = 6(10+x)$$

$$42 + 9x = 60 + 6x$$

$$18 = 3x$$

$$x = \color{brown}\boxed{6}$$

Mar 7, 2022