The expression represents the probability of getting exactly 3 heads is .
Aron flips a penny 9 times.
We have to determine
Which expression represents the probability of getting exactly 3 heads?
<h3>What is binomial distribution?</h3>The binomial distribution is determined as the probability of mass or discrete random variable which yields exactly some values.
The binomial probability formula shown has variables which represent:
Where n is the total number of trials (here, we flip penny 9 times, hence n = 9).
r is the number we want to find (here, we want the probability of 3 heads, so r = 3).
p is the probability of success (here, success means getting heads.
So, in a coin flip the probability of heads is always 1/2, so p = 1/2).
Therefore,
The expression represents the probability of getting exactly 3 heads is;
Hence, the expression represents the probability of getting exactly 3 heads is .
To know more about Binomial Distribution click the link given below.