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

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

anonymous · Answer

help?

anonymous · Answer

@it_meh_miranda

anonymous · Answer

hey sry i didnt help before my os wasnt working

hugsnotughs · Answer

Oh gosh I hated these problems in middle school.

kropot72 · Answer

The experimental probability of drawing a blue marble is 12/60 = 1/5.
There are 45 marbles in the bag, so the expected number of blue marbles is:
$$45\times\frac{1}{5}=you\ can\ calculate$$