Hugo scores an average of 28 points per basketball game, and his points per basketball game are normally distributed. Suppose Hugo scores 14 points in a game, and this value has a z-score of −2. What is the standard deviation?

Find the length of the following tangent segments to the circles centered at o and o' whose radii are 5 and 3 respectively and the distance between o and o' is 12. what is the tangent segment of cd?

Three coins are flipped. what is the probability that there will be at least two tails?

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?