A shipment of 13 microwave ovens contains six defective units. A vending company purchases four units at random. (a) What is the probability that all four units are good?

(b) What is the probability that exactly two units are good?

(c) What is the probability that at least two units are good?

How many grams the dog will eat in 3 days?

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.

Aprobability experiment is conducted in which the sample space of the experiment is s={7,8,9,10,11,12,13,14,15,16,17,18}, event f={7,8,9,10,11,12}, and event g={11,12,13,14}. assume that each outcome is equally likely. list the outcomes in f or g. find p(f or g) by counting the number of outcomes in f or g. determine p(f or g) using the general addition rule.