Iceberg lettuce is grown and shipped to stores for about 30 cents a head, and consumers purchase it for about 72 cents a head. find the percent increase.

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