If two unbiased coins are tossed, then what is the probability of having at least one head?

A machine produces a defective component with a probability of 0.015. The number of defective components in a packed box containing 200 components produced by the machine follows a Poisson distribution. The mean and the variance of the distribution are

A six-face fair dice is rolled a large number of times. The mean value of the outcomes is _________.

Two coins are tossed simultaneously. The probability (upto two decimal points accuracy) of getting at least one head is _________.