[問題] 統計的計算
In a game called Taxation and Evasion, a player rolls a pair of dice.X
If on any turn the sum is 7,11 or 12, the player gets audited.
Otherwise, she avoids taxes. Suppose a player takes 5 turns at rolling
the dice. The variance of the number of times she will be audited is _____.
Based on past experience, it is assumed that the number
of flaws per foot in rolls of grade 2 paper follows a Poisson
distribution with an average of 1 flaw per 5 feet of paper
(0.2 flaw per foot). what is the probability that in a
question
a. 1-foot roll there will be at least 2 flaws?
b. 12-foot roll there will be at least 1 flaw?
c. 50-foot roll there will be between 5 and 15 (inclusive) flaws?
希望能把這兩題算式都列出來
感謝
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