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vvvidenov

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## Homework Statement

A school contains students in grades 1,2,3,4,5 and 6. Grades 2,3,4,5 and 6 all contain the same number of students, but there are twice this number in grade 1.

a)If a student is selected at random from a list of all the students in the school, what is the probability that he will be in grade 3?

b)What is the probability that the selected student will be in an odd-numbered grade?

## Homework Equations

## The Attempt at a Solution

Let n=the size of grade(s) 2,(3,4,5,6) then 2n=the size of grade 1.

So the size of the sample space I don't know how to find.

I really need help on this. I am not sure what to do from here at all. Thanks.

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