Paul's Class I

Probability Level 3

In the clasroom of Paul there are 25 pupils, 8 have glasses and there are two red hair pupils. Which is the probabiblity in % of finding a red hair boy with glasses?

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Note: If the answer is for example 50.23 % just write 50.23


The answer is 2.56.

Jaime Andrés by Jaime Andrés , 21, Spain

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1 solution

Laura Lion
Sep 2, 2015

(8/25)*(2/25)= 2,56%

1 Helpful 0 Interesting 0 Brilliant 0 Confused

Hi !

I'm new on this website but I think that 2.56 is wrong : If there's only 1 red hair pupil, the chance that he also has glasses is 8/25 = 32% If they are 2, there are more chances that one of them is also has glasses. So the solution is higher than 32%...

The solution : (8/25) + (17/25)*(8/24) = 54.666666... ~ 54.67%

Corentin Geoffray - 5 years, 8 months ago

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