Worksheet on Probability




Probability (or likelihood) is the chance that something will happen - how likely it is that some event will happen.
The likelihood of event A is the number of ways event A can occur divided by the total number of possible outcomes.

1. A die is thrown once. The chance of getting a prime number is :
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2. Which of the following cannot be chance of an event? a) 1 b) -1.5
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3. If chance of happening of an event is 3/7, then the chance of not happening this event is :
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4. If P(E) = 0.07, then the chance of ‘not E’ is :
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5. The chance of sure event is :
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6. The chance of an impossible event is :
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7. A die is thrown once. The chance of getting a number less than 3 is :
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8. If one card is drawn from a deck of 52 cards, then the chance of getting black king is :
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9. In a simultaneous toss of two coins, the chance of exactly one head is :
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10. Dan throws a die once. The chance that he shows a number less than 5 is :
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11. Two coins are tossed simultaneously 500 times, and we get Two heads : 105 times.Find the chance of occurrence of this event.
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12. The record of a weather station shows that out of the past 250 consecutive days, its weather forecasts were correct 175 times.What is the chance that on a given day it was correct?
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13.In a cricket match, a batswoman hits a boundary 6 times out of 30 balls she plays. Find the chance that she did not hit a boundary.Also find the chance that she hit the boundary.
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Probability

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