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

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

A simple of $$15$$ data is as follows; $$17,18,17,17,13,18,5,5,6,7,8,9,20,17,3.$$ The mode of the data is