Abakery purchased 12 pounds of sugar and 15 pounds of flour from its supplier for $9.30. the next day at the same prices they purchased 10 pounds of flour and four pounds of sugar for $4.60. find the cost per pound of flour.

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