There are 15 boys and 10 girls in a hall, each holding a coin in there hand.
the mean number of coins for the children is 11.
the mean number of coins for the boys is 5.

work out the mean number of coins for the girls.

1/5^2 = 7.56/45

answer: need picture of problem

step-by-step explanation:

2 and 1.

step-by-step explanation:

plug in each answer. 0 doesn't work, 1 does. so does 2. 4 doesn't:

0 = 1 is not true.

2 = 2 is true.

4 = 4 is true.

8 = 16 is not true.

hope this !