1
GATE ECE 2016 Set 1
Numerical
+1
-0
The second moment of a Poisson-distributed random variables is $$2.$$ The mean of the random variable is _______.
Your input ____
2
GATE ECE 2015 Set 2
Numerical
+1
-0
Let the random variable $$X$$ represent the number of times a fair coin needs to be tossed till two consecutive heads appear for the first time. The expectation of $$X$$ is ________.
Your input ____
3
GATE ECE 2015 Set 2
MCQ (Single Correct Answer)
+1
-0.3
Ram and Ramesh appeared in an interview for two vacancies in the same department. The probability of Ram's selection is $$1/6$$ and that of Ramesh is $$1/8$$. What is the probability that only one of them will be selected?
A
$$47/48$$
B
$$1/4$$
C
$$13/48$$
D
$$35/48$$
4
GATE ECE 2015 Set 3
Numerical
+1
-0
The variance of the random variable $$X$$ with probability density function $$\,f\left( x \right) = {1 \over 2}\left| x \right|{e^{ - \left| x \right|}}\,\,$$ is ___________.
Your input ____
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