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# Quiz 1 Mat540 1) you are given a bag containing 12 checkers, 5 of which are black.

Quiz 1 Mat540
1) you are given a bag containing 12 checkers, 5 of which are black. You select 3 checkers from the bag without replacing any, what is the probability that you selected 2 black checkers?
2) Sales/mo Probability
10000 0.57512
22000 0.22508
37000 0.08561
Given the data above, what can you credibly say about next month sales?
3) Good little children are rare. Only 2 out 10 qualify. When Santa lands on a house with 3 children , what is the probability that 2 of these children are good?
4) Sales Month
12500 1
13700 2
9800 3
10100 4
11775 5
12905 6
On this basis, How unusual is a month with sales of 15000?
5) Sales/week Probability
100 0.1
125 0.2
150 0.6
175 0.1
Calculate the expected value and standard deviation for the sales?

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