Question

a bag contains 14 red tiles, 20 blue tiles, and 16 green tiles, a tile is randomly drawn from the bag. if this is done 40 times how many times do you expect to draw a blue tile

Answer 1

Total=14+20+16=50
P(blue)=20/50=2/5

so, answer=(2/5)*40=16

Answer 2

There are total 16+14=30 tiles which are not blue.
So, we can get maximum 30 tiles of different colours(not blue) in our first 30 chances then we must get at least 10 blue marbles in our next 10chances.
Therefore, we expect at least 10blue marbles if we drawn marbles randomly for 40 times from the bag.

I hope it will help you.