First of all you do 2+3=5 then 1100/5 is 220
so 2*220=440
3*220= 660
so that means 440 boys and 660 girls
it depends on which order the boys and girls are put
55% is crackers if the 11 is crackers
The sample space of the experiment (i.e. the total number of ways he can pick 7 random pages out of a total of 6 + 4 = 10 pages) is given by:

If he picks at least 5 pages of maths homework, this means that he either picked 5 pages or 6 pages of maths homework.
The number of ways he can pick 5 or 6 maths homework is given by:

Therefore, the probability that he recovers at least 5 pages of his math homework is given by:
The mean of n numbers is the sum of these numbers divided by n.

The mean of the data set is 20.
First off, let's convert the mixed fraction to "improper", and then check "how many times does 1/3 go into 7 and 5/6?"