Back to: MATHEMATICS SS2

**Welcome to class! **

In today’s class, we will be talking about probability. Enjoy the class!

**Probability**

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**DEFINITION OF TERMS**

(i)**Event**: When an experiment is performed two or more results or outcomes will be expected to happen. Each attempt is called a trial and the outcome of a trial and the outcome of a trial is called an event, usually denoted by E.

(ii)**Random Experiment**: A random experiment is a repetitive process which may result in any one of the possible outcomes of the experiment OR:

(iii)**Sample space**: The sample space of a random experiment is the set containing all the possible outcomes of the experiment OR:

Sample space is all the possible outcomes of a trial in an experiment usually denoted by S.

(iv)The number of the points in a sample space n(s), and in an event, E is n(E).

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**EVALUATION**

Use the figure below to answer the following:

16 | 2 | 3 | 13 |

5 | 11 | 10 | 8 |

9 | 7 | 6 | 12 |

4 | 14 | 15 | 1 |

(a) If a number is picked at random from the figure. What is the probability that it is:-

(i) Odd (ii) Prime (iii) even (iv) less than 10

(v) Exactly divisible by 3 (vi) a perfect square (vii) a perfect cube?

(b) If a row or column is picked at random from the figure. What is the probability that the total of its no is(i) 34 (ii) 35

** ****GENERAL EVALUATION**

- A bag contains black balls, 3 green balls and 4 red balls, A ball is picked form the bag at random, what is the probability that it is (a) Black (d) yellow (c) Green (d) not black (d) either black ore red
- A school contains 357 boys and 323 girls if a student is chosen at random, what is the probability that a girl is chosen.

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In our next class, we will be talking more about** probability.** We hope you enjoyed the class.

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