Find the slope of the line y=3/4x + 4

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

(x-5)1/2+5=2 what is a possible solution?

Is the number 128.439 a rational number