The standard deviation is 19.91.
To find the standard deviation is a binomial distribution, you have to take the square root of the total number multiplied by the percent and its compliment.
Our expression will be:

This will evaluate to about 19.91.
15 cards = 9$
1 card = (9/15)$
12 cards = 9/15 * 12
= 108/15
= 7.2$
Answer: 60/13
Step-by-step explanation:
Answer: D is my best guess
Step-by-step explanation: