Question 1

Complete the following statements:
(i) Probability of an event E + Probability of the event ‘not E’ =                  .
(ii) The probability of an event that cannot happen is                  . Such an event is called                       .
(iii) The probability of an event that is certain to happen is                  . Such an event is called                  .
(iv) The sum of the probabilities of all the elementary events of an experiment is                   .

(v) The probability of an event is greater than or equal to                   and less than or equal to                  .

Answer
  1. Probability of an event + probability of an event not E = 1
  2. Probability of an event that cannot happen is 0. Such event is called an impossible event.
  3. The probability of an event that is certain to happen is 1. Such event is sure event.
  4. The sum of probabilities of all the elementary events of an Experiment is 1.          
  5. Probability of an event is great than or equal to zero and less than or equal to 1.                                        

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