Standard deviation and mean: Is it unusual for a team to win in four​ games?

mathshelp123

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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
 
What are your thoughts? What have you tried? Do you know what the terms "mean" and "standard deviation" mean and how to calculate them? Please comply with the rules as laid out in the Read Before Postinghttps://www.freemathhelp.com/forum/threads/46556-Read-Before-Posting! thread that's stickied at the top of each sub-forum, and share with us any and all work you've done on this problem, even the parts you know for sure are wrong. Thank you.
 
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