1. Discrete Probability Distribution.

2. Main parameter is mean which is equal to np where n is no. of trials , p is probability.

3.It is positively skewed distribution.

4.Mean = variance = m = np

5. Standard Deviation = m^ 1/2

6. skewness = 1/m^1/2

7. kurtosis = 1/ m

8. m normally lies between 0 , 1 and 10.

9. p is small and n is quite large .

1. Events are independent .

2. Probability of a single occurence of the event in a given interval is proportional to the length of the interval.

3.Probability of occurance of more than one event in a very small interval is negligible .

1. no. of defective blades in a pack of 100 .

2. no. of cars passing a certain point in a minute .

3. no. of persons born deaf and dumb per year in a city .

4. no. of typographical errors per page .

5. no. of deaths per day in a district or town in one year by a disease but not epidemic.

6. no. of telephone calls received at a particular switch board per minute during a certain hour of the day .