Consider a Poisson distribution for the tossing of a biased coin. The mean for this distribution is $$\mu $$.

The standard deviation for this distribution is given by

The area (in percentage) under standard normal distribution curve of variable $$Z$$ within limits from $$-3$$ to $$+3$$ is ________.

The probability of obtaining at least two $$'SIX'$$ in throwing a fair dice $$4$$ times is

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?