A phone company offers two monthly plans. Plan A costs $26 plus an additional $0.08 for each minute of calls. Plan B costs $21 plus an additional $0.10 for each minute of calls.

Every time you drive you will experience a combination of driving conditions and environments.

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?

How can you check that you have correctly converted frequencies to relative frequencies?