Question

There are 4 times as many blue blocks as there are green blocks. Angelique picks a block at random.

Colour Red Green Yellow Blue
Probability 0.2 - 0.05 -
Complete the table to show the probability of picking each colour.

Answer 1

Answer: Red =0.2; Green =0.15; Yellow = 0.05; Blue =0.6

Explanation:

Well, gotta imagine the probablity of the block is green = a, the probablity of the block is blue = b. So: 0,2+a+0,05+b=1

for those’re 4 times as many blue blocks as green blocks: b=4a

a+b=1-0.25=0.75

4a+a=0.75; a=0.15

b=4a=0.15x4=0.6; b =0.6