An unbiased coin is tossed five times. The outcome of each loss is either a head or a tail. Probability of getting at least one head is _______.

Let $$X$$ and $$Y$$ be two independent random variables. Which one of the relations $$b/w$$ expectation $$(E),$$ variance $$\left( {{V_{ar}}} \right)$$ and covariance $$\left( {{C_{ov}}} \right)$$ given below is FALSE?

A single die is thrown two times. What is the probability that the sum is neither $$8$$ nor $$9?$$

The following data about the flow of liquid was observed in a continuous chemical process plant

Mean flow rate of the liquid is