A success in this situation is a strike, so
and
.
Each frame represents a trial, so
.
Find the probability that Carol succeeds
times out of
trials :
So let
.
To find this probability, find the value of the term
in the expansion of
.
Where
and
.
Substitute the values
and
in the equation
.

.

Therefore, the probability that Carol succeeds
times out of
trials is
.
The probability that Carol succeeds
times out of
trials is
.