There is a 0.0416 probability that a best-of-seven contest will last four games, a 0.0804 probability that it will last five games, a 0.2132 probability that it will last six games, and a 0.6648 probability that it will last seven games.

Question

There is a 0.0416 probability that a​ best-of-seven contest will last four​ games, a 0.0804 probability that it will last five​ games, a 0.2132 probability that it will last six​ games, and a 0.6648 probability that it will last seven games.

Find the mean and standard deviation.

Is it unusual for a team to win in four​ games? Choose the correct answer below.
A - No​, because the probability that a team wins in four games is less than or equal to 0.05
B - 
Yes because the probability that a team wins in four games is greater than 0.05
C - 
Yes, because the probability that a team wins in four games is less than or equal to 0.05
D - 
No because the probability that a team wins in four games is greater than 0.05

There is a 0.0416 probability that a​ best-of-seven contest will last four​ games, a 0.0804 probability that it will last five​ games, a 0.2132 probability that it will last six​ games, and a 0.6648 probability that it will last seven games.

There is a 0.0416 probability that a best-of-seven contest will last four games, a 0.0804 probability that it will last five games, a 0.2132 probability that it will last six games, and a 0.6648 probability that it will last seven games.