William's Probability Problem

Probability Level 2

William picks a marble out of a bag, the bag contains 1 blue marble, 2 red marbles, 3 orange marbles, and 4 green marbles. What is the chance that William will pick a blue marble?

40% 25% 10% 20%

William Feung by William Feung , 16, Hong Kong

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2 solutions

William Feung
Mar 27, 2019

The answer is 10% because 1+2+3+4=10 and there is only one blue marble. So 1/10=10%.

0 Helpful 1 Interesting 0 Brilliant 0 Confused

It's basically like the color marble that has two of them has a 20% chance the one with only one marble of a color has a 10% chance of getting picked because there are ten marbles in the bag.

William Feung - 2 years, 2 months ago

(#of blue balls=1)/(#of balls=1+2+3+4=10)

= 1 10 \frac{1}{10}

=0.1

=10%

0 Helpful 0 Interesting 0 Brilliant 1 Confused

By the way, this was too easy.

I changed my name. - 2 years, 2 months ago

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