Subscribers toInvestment Advice White Lettersperform security transactions at the rate of six trades per month. Assume that one of the subscribers performs transactions at this rate and the probability of a transaction for any two months is the same and the number of transactions in one month is independent of the number of transactions in another month.

1. What is mean number of transactions per month for this subscriber?

2. What is probability that no security transaction will be conducted in one month?

3. What is probability that exactly nine security transactions will be conducted in one month?

4. What is probability that at least six security transactions will be conducted in one month?

5. What is probability that more than two but fewer than seven security transactions will be conducted in one month?