A point is [8,5] and b is the point [-4,1] determine the coordinates of the midpoint of ab

Find the x coordinate of the point.

What is the size of the matrix resulting from

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