I need help with 2 probability / standard deviation problems. Any help is greatly appreciated!?

Question

17. Find the standard deviation for the following set of numbers. Round to the nearest hundreth.
2, 1, 5, 2, 8, 5, 9

18. The probability that a certain baseball team will win a given game is 0.46. If the team plays 100 games, find the expected number of wins and the standard deviation. Round to the nearest hundreth, if necessary.

Answer 1

σ = 4.956477

The expected number of winns is 46 with a σ of 4
6