A bag contains 12 red marbles, four black marbles, four purple marbles, and two pink marbles. What is the probability of selecting a black marble

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?

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You work in a hospital that has 9 floors. you need to see 3 patients on each floor. how many patients do you need to see in all?