[問題] 關於統計
according to Barron's 1998 Primary Reader Survey,the average annual number of
investment transactions for a subscriber is 30.Suppose the number of transaction
in a year follows the Poisson probability distribution.
a. Show the probability distribution for the time between investment
transactions.
b. What is the probability of no transactions during the month of January for
a particular subscriber?
c. What is the probability that the next transaction will occur within the
next half month for a particular subscriber?
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