What is the probability of rolling a 7 with one roll of standard number cube?

P('7' with standard cube) = 0

Because a standard cube has only six(6) faces.

P(night follows day) = 1

It is an event which WILL ocuur.

The results to any probability question are ALWAYS between '0' and '1'.

Any calculated results outside the 0-1 range are incorrect, and need to be recalculated.

e.g.

When tossing an unbiased two-sided coin

P(heads on a coin) = 1/2 = 0.5

P(tails on a coin ) = 1/2 = 0.5

Notice the answer is between '0' and '1'

NB The is no such law as the 'Law of Averages' in mathemtictics. it is a fictitious invention. What people mean is the probability of an event occurring.