the answer is PMF(x,y) = Prob{X prefer nonsmokers and Y prefer smokers}
Support: 0<=X<=7, 0<=Y<=7, 0<=X+Y<=7.
PMF = Combinations(X of 7) * Combinations(Y of 7-X) * 0.78^X * 0.01^Y * 0.21^(7-X-Y)
(b)
The marginal PMF comes from summing the joint PMF over over Y. Alternatively, we can get it directly:
Support: 0<=X<=7
PMF(X) = Combinations(X of 7) * (0.78)^X * (0.22)^(7-X)
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Answer:
35
Step-by-step explanation:
Simply subtract 31 from 66 to receive the value of x
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Answer:
-6
Step-by-step explanation:
1.50 x + 2 x = 10.50
add similar elements:
1.50 x + 2 x = 3.5 x
3.5 x = 10.50
x = 10.50 / 3.5
x = 3 magazines.
hope this helps!