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)
brainliest plzz worked really hard on this thxx god bless
Answer:
x=-1, y=1
( -1,1)
Step-by-step explanation:
Lets solve these by elimination. We will add the two equations together and eliminate y
x+y=0
x-y+2=0
------------------
2x +2 = 0
Subtract 2 from each side.
2x+2 -2 =0-2
2x = -2
Divide by 2 on each side to get x alone.
2x/2 = -2/2
x = -1
Now that we have x, we need to solve for y
x+ y =0
Substitute x back into the equation.
-1 + y = 0
Add 1 to each side
-1+1 +y = 0 + 1
y =1
( -1,1)
Answer:
31.1
Step-by-step explanation:
Answer:
16x+29
Step-by-step explanation:
-5(2x-3) x 2+4x-1
-10(2x-3) + 4x-1
-20x + 30+4x -1