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Poisson Distribution

Theory and Formula


Question


Q1. Poisson distribution was initially derived by

(a) Gauss

(b) Spearman

(c) Simon Denis

(d) None of these

Solution.c
Simon Denis
Solution

Q2. m is a parameter of poisson distribution it will be .

(a) negative

(b) positive

(c) zero

(d) none of these

Solution. b
Note : In poisson distribution m is a parameter that is equal to mean and variance.Variance can not be negative .
Solution

Q3. The value of e-m is always

(a) less than zero

(b) less than one

(c) Equal to zero

(d) More than one

Solution. b
less than one
Solution

Q4. If the mean of poisson distribution is 81, find S.D .

(a) 9

(b) 10

(c) 11

(d) 12

Solution.
In poisson distribution mean = variance

and S.D = √variance

So S.D is 9
Solution

Q5. Mean of poisson distribution is 25 , find coefficient of variance .

(a) 30%

(b) 10%

(c) 20%

(d) 40%

Solution. c
C.V =
S.D/mean
x 100

=
5/25
x 100 = 20%

Solution