Probability

Chapter 5 Class 8 Data Handling
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Transcript

Ex 5.3, 6 Find the probabilities of the events given in Question 2. Question 2 is When a die is thrown, list the outcomes of an event of getting (i) (a) a prime number (b) not a prime number. Total number of outcomes = 6 (i) (a) Number of outcomes of getting a prime number = 3 Probability = (ππ’ππππ ππ ππ’π‘πππππ  ππ πππ‘π‘πππ π πππππ ππ’ππππ)/(πππ‘ππ ππ’ππππ ππ ππ’π‘πππππ ) = 3/6=1/2 (b) Number of outcomes of getting not a prime number = 3 Probability = (ππ’ππππ ππ ππ’π‘πππππ  ππ πππ‘ πππ‘π‘πππ π πππππ ππ’ππππ)/(πππ‘ππ ππ’ππππ ππ ππ’π‘πππππ ) = 3/6=1/2 Ex 5.3, 6 Find the probabilities of the events given in Question 2. Question 2 is When a die is thrown, list the outcomes of an event of getting (ii) (a) a number greater than 5 (b) a number not greater than 5. (ii) (a) Number of outcomes of getting a number greater than 5 = 1 Probability = (ππ’ππππ ππ ππ’π‘πππππ  ππ πππ‘π‘πππ π ππ’ππππ πππππ‘ππ π‘βππ 5)/(πππ‘ππ ππ’ππππ ππ ππ’π‘πππππ ) = 1/6 (b) Number of outcomes of getting not a greater than 5 = 5 Probability = (ππ’ππππ ππ ππ’π‘πππππ  ππ π πππ‘π‘πππ π ππ’ππππ πππ‘ πππππ‘ππ 5)/(πππ‘ππ ππ’ππππ ππ ππ’π‘πππππ ) = 5/6