Question

A bag contains 45 marbles of various colors. Jon draws 60 times, each time replacing the marble before drawing again. He gets a total of 12 blue marbles.

Which is best prediction of how many blue marbles are in the bag?

A.
5

B.
9

C.
12

D.
15

Answer 1

Each time Jon draws his chances of drawing a blue marble are equal (because he replaces the marble he draws there are always 60 and they don't change).

So of the 60 draws, 12 of them were blue... or 12/60 or 1/5.

1/5 of 45 marbles is 9. So, B.

Answer 2

Correct @luffingsails

Answer 3

TY:)