PROBABILITY

PROBABILITY

1. THEORETICAL PROBABILITY

   • 0<P(E)<1 ; P(E) = No. of trials in which the event happened / Total no. of trials

2. DEFINATION

   • Sure or Certain Event:- Event having probability to occur as 1
   • Elementary Event:- Event having only outcome of the experiment
   • Complementary Event:- For event E , complement event P(Ē) = 1-P(E)
   • Impossible Event:- Probability of an event is equal to 0

3. VALUE

   • Sun of probabilities of all elementary events is 1. For events A, B, C; P(A)+P(B)+P(C) = 1

4. EXPERIMENTAL PROBABILITY

   • What actually happens in an experiment : P(E) = No. of outcomes favourable to E / No. of all possible outcomes of the experiment