(x^4+3x^3-+x)=(x^4+3x^3-)+(x^4+3x^3 -2x^3)(x) is an example of: a. multiplying two binomials b. foil c. vertical multiplication d. the distributive property

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