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# S2 poisson distribution question watch

1. A newsagent has 4 copies of a particular magazine in stock. She knows that demand for this magazine follows a poisson distribution with mean U, where U is an integer.
The newsagent has observed that she is unable to meet the demand for the magazine about 1 week in 20.
A) use statistical tables provided to find the value of U.
B) the newsagent makes a loss on the magazines unless she sells at least 2. Find the probability that she makes a loss.
C) the newsagent decides to increase her stock so that she is only able to
meet demand in 1 week in 100. Find the number of magazines she must have in stock.

Please can somebody come to the rescue; i don't have a clue where to start
2. (Original post by shubhondeb)
A newsagent has 4 copies of a particular magazine in stock. She knows that demand for this magazine follows a poisson distribution with mean U, where U is an integer.
The newsagent has observed that she is unable to meet the demand for the magazine about 1 week in 20.
A) use statistical tables provided to find the value of U.
B) the newsagent makes a loss on the magazines unless she sells at least 2. Find the probability that she makes a loss.
C) the newsagent decides to increase her stock so that she is only able to
meet demand in 1 week in 100. Find the number of magazines she must have in stock.

Please can somebody come to the rescue; i don't have a clue where to start
Start by converting the english into mathematics. Take it one sentence at a time. See what you can do.

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