a) we will examine the probability a couple who has 12 children has exactly 7 boys.

b) Next we will look at the probability that they have more than 7 boys.

c) Finally we will look at the probability that they have at most 7 boys.

Assume a .7 chance of having a boy.

Solution can be solved using excel.

a) On this example we will examine the probability a couple who has 12 children has exactly 7 boys.

Type this in an excel cell

=binom.dist(12,7,.7,False)

and then hit enter

What would be the answer?

b) Next we will look at the probability that they have more than 7 boys.

Type this in an excel cell

=1-binom.dist(12,7,.7,True)

and then hit enter

what would be the answer?

c) Finally we will look at the probability that they have at most 7 boys.

Assume a .7 chance of having a boy.

Type this in an excel cell

=binom.dist(12,7,.7,True)

and hit enter

what would be the answer