Basic Probability - Online Math Tutoring

Basic Probability - Online Math Tutoring Probability is the chance that something will happen; there are two kinds of probability, theoretical and experimental. Experimental probability = numberofeventoccurences / (Total number of trials) Theoretical probability = (Number of favourable outcomes) / (Total number of outcomes) Example 1: Which of the following is an experiment? Tossing a coin Rolling a single 6 sided die Choosing a ball from a jar All of the above Answer: d Example 2: A number from 1 to 13 is chosen at random. What is the probability that the selected number is a prime number? Answer: Prime numbers from 1 to 13 are 2, 3, 5, 7, 11, 13. Number of prime numbers = 6 Probability of selecting a prime number = 613 Example 3: What is the probability of drawing a red colored ace from a set of cards ? Answer: Total number of cards in a set = 52 Total number of red colored cards = 13 x 2 = 26 Number of aces in red colored cards = 2 probability of drawing an ace from a red colored card = 226 = 113