Over 500 million tweets are sent per day (digital Marketing ramblings website, December 15, 2014). Assume that

Question:

Over 500 million tweets are sent per day (digital Marketing ramblings website, December 15, 2014). Assume that the number of tweets per hour follows a Poisson distribution and that Bob receives on average 7 tweets during his lunch hour.

a. What is the probability that Bob receives no tweets during his lunch hour?

b. What is the probability that Bob receives at least 4 tweets during his lunch hour?

c. What is the expected number of tweets Bob receives during the first 30 minutes of his lunch hour?

d. What is the probability that Bob receives no tweets during the first 30 minutes of his lunch hour?

Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...