John made 3 out of 12 baskets in the game what percentage of the shots did he make

Which values for a and b will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b

What is the probability of drawing three queens from a standard deck of cards, given that the first card drawn was a queen? assume that the cards are not replaced.

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?