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Ex 15.1, 8 - Chapter 15 Class 10 Probability (Term 1)
Last updated at March 22, 2023 by Teachoo
Ex 15.1
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Ex 15.1, 2 Important
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Ex 15.1, 4 (MCQ) Important
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Ex 15.1, 8 You are here
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Ex 15.1, 12 Important
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Ex 15.1, 18 Important
Ex 15.1, 19 Important
Ex 15.1, 20* (Optional) Important
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Ex 15.1, 24 Important
Ex 15.1, 25 (i) Important
Ex 15.1, 25 (ii)
Chapter 15 Class 10 Probability
Serial order wise
Transcript
Ex15.1, 8 A bag contains 3 red balls and 5 black balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is (i) red? Total number of balls in the bag = 5 + 3 = 8 Number of red balls = 3 Probability of getting a red ball = (𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑟𝑒𝑑 𝑏𝑎𝑙𝑙𝑠)/(𝑇𝑜𝑡𝑎𝑙 𝑛𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑏𝑎𝑙𝑙𝑠) = 3/8 Ex15.1, 8 A bag contains 3 red balls and 5 black balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is (ii) not red? Total number of balls in the bag = 8 Probability of not getting a red ball = Probability of getting blackballs = (𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓𝑏𝑙𝑎𝑐𝑘 𝑏𝑎𝑙𝑙𝑠)/(𝑇𝑜𝑡𝑎𝑙 𝑛𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑏𝑎𝑙𝑙𝑠) = 5/8 Method 2 Probability of not getting red ball = 1 − Probability of getting a red ball = 1 – 3/8 = 5/8
