Grade 8 | Unit 8.3 | Page 9
Unit 8.3
Transparency 2
More on probabilities
• There is no pattern in gambling games of chanc...
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8.3 trans 2

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8.3 trans 2

  1. 1. Grade 8 | Unit 8.3 | Page 9 Unit 8.3 Transparency 2 More on probabilities • There is no pattern in gambling games of chance (like the Lotto, coin tossing, dice throwing, card-picking, slot machines) on which to base predictions. You can, however, calculate the likelihood of a particular outcome and you can also calculate your chances of winning. The number assigned to this likelihood is called a probability. • Probability lies between 0 and 1, where 0 = impossible and 1 = certain. Probabilities may be represented by fractions, e.g., 1/2, (a 1 in 2 chance that an event will occur - like heads or tails), 1/6, (for dice) etc; or alternatively as decimal numbers between 0 and 1, e.g., 0.5, 0.25, 0.66666, etc. • The general rule for calculating the probability of an outcome of an event (like picking a card) is: p = n/t p stands for probability, n for the number of favourable outcomes, and t for the total number of all possible outcomes • How many cards in a deck? • How many 9 are there in a deck? • What do you think the chances are of picking or drawing 9 from a deck (no peeking beforehand! The draw must be a random process!) • What is the probability of picking any card from the deck? • What is the probability of drawing any red card ( and o) from the deck?

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