Homework Help: Math

Posted by Emily on Monday, April 27, 2009 at 12:48pm.

A class is made up of 10 boys and 2 girls. Half of the boys wear glasses. A student is selected at random from the class. What is the probability that the student is a boy with glasses?

My Question is, I don't know how to do Probability.

Math - Reiny, Monday, April 27, 2009 at 12:53pm
in general,
the probability of "some event"
= no of cases for that event/total number of cases

so in our case, there would be 5 boys with glasses, the "event"
the total number of students = 12

so the prob(boy with glasses) = 5/12

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