Each day a newsstand purchases a certain quantity of papers.Demand is Poisson and averages 25 newspapers per day.

The wholesale cost of newspapers is $1.00 apiece.If the newsvendor sells papers at $1.50 each, what is his average profit?What percentage of days does he lose money?

How many papers should he purchase to maximize his gain?

Newspapers purchased Expected Profit Standard Deviation Probability Lose Money

20 ? ? ?

21 ? ? ?

22 ? ? ?

23

24

25

26

27

28

29

30

Please use tamstat software for solving this problem and also provide formula used in tamstat for solving this..