Question

At school there are the same number of boys and girls. A student is chosen at random to raise the flag. How many times is it expected that a boy will raise the flag over 30 days of​ school?

Answer 1

It is expected that a boy will raise the flag 15 times

Explanation:

If in the school there are the same number of boys and girls, when picking a random student, the probability of this student being a boy is 50% = 0.5.

So to find how many times it is expected that a boy will raise the flag over 30 days, we just need to multiply the total number of days by the probability of the student raising the flag each day being a boy:

30 * 0.5 = 15

It is expected that a boy will raise the flag 15 times.