What is the probability that a student chosen at random out of 3 girls and 4 boys is a boy?

What is the probability of the sun setting tomorrow?

When a spinner with three colours (Fig. 3.5) is rotated, which colour has more chance to show up with arrow than the others?

The letters written on paper slips of the word MEDIAN are put in a bag. If one slip is drawn randomly, what is the probability that it bears the letter D?

Classify the following events as certain to happen, impossible to happen, may or may not happen:

A. Getting a number less than 1 on throwing a die.

B. Getting head when a coin is tossed.

C. A team winning the match.

D. Christmas will be on 25 December.

E. Today moon will not revolve around the earth.

F. A ball thrown up in the air will fall down after some time.