probability that number rolled is greater then 3......on a number cube, there is 3 numbers greater then 3 (4,5, and 6)...and there is a total of 6 numbers...so the probability would be 3/6 which reduces to 1/2.
probability that a coin toss ends up heads....there is 1/2 a chance it will end up heads, just like there is 1/2 a chance it ends up tails
and since these are both independent events...they are to be multiplied
so the probability of both events happening are : 1/2 * 1/2 = 1/4
