UG I lost my account and my rank was expert now i have to start over

The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

Select the lengths in centimeters that would form a right triangle