Question

A random variable X has the following probability

distribution

X	0	1	2	3	4	5	6	7	8
P (X = x)	A	3a	5a	7a	9a	11a	13a	15a	17a

Then the value of 'a' is

• A. 1/81
• B. 2/82
• C. 5/81
• D. 7/81

Answer 1

Answer: (A)

1/81

Answer 2

For a probability distribution

a + 3a + 5a + 7a + 9a + 11a+ 13a+ 15a+ 17a = 1

a = $\frac { 1 } { 81 }$