g62 Q.127 A random variable X has a probability density function, Jkx"e**; 120 f(x) = (n is an integer) 0; otherwise with mean 3. The values of {k, n) are 1 (a) (b) 2 (c) 2 2 (d) (12) g62 Q.127 A random variable X has a probability density function, Jkx"e**; 120 f(x) = (n is an integer) 0; otherwise with mean 3. The values of {k, n) are 1 (a) (b) 2 (c) 2 2 (d) (12)