There are 5 red marbles, 8 blue marbles, and 12 green marbles in a bag.

What is the theoretical probability of randomly drawing a red marble?

25%

20%

62.5%

41.7%

Total number of marbles:

5+8+12 = 25

Probability of drawing red marble = red/total

= 5/25 = 1/5

Percentage of drawing red marble: 1/5 x 100 = 20%

Ans: 20%

To find the percentage always multiply whatever decimal number you have by 100%

1) 5 + 8 + 12 = 25 (total number in bag)

5/25 x 100% (because you're trying to find probability of red)

= 20%

2) 5 + 8 = 13 (# of red AND blue)

13/25 x 100% (divide out of the total)

=52%

3) 5/25 = 0.2 x 12/25 = 0.48 (find probability of drawing red and green)

0.2 x 0.48 x 100%

= 9.6%

4) 10 + 12 + 28 = 50 (to find total number of trials)

28/50 x 100%

= 56%

5) 5 x 7 (number of sections on first spinner multiply by # of sections on second spinner)

= 35 Its B 20%