Suppose 40 of the TV sets in use in the US on a particular n

Suppose 40% of the TV sets in use in the U.S. on a particular night were tuned in to game 7 World Series. If, instead, the sample consisted of 15 in-use TVs, what is the probability five or more are tuned to the World Series?

Solution

p= 40% ; q=60% ; n=15 ; r=5.

prob = ncr * p^r * q^(n-r)

=15c5 * (0.4)^5 * (0.6)^5

=3003 * 0.01024* 0.07776

=2.3911

The probability five or more are tuned to the World Series is 2.3911.