The joint probability distribution of the number X of cars and the number Y of buses per signal cycle at a proposed left-turn lane is displayed in the accompanying joint probability table. p(x, y) X y 1 0 1 2 0 0.015 0.010 0.030 0.020 0.075 0.050 3 0.090 0.060 4 0.060 0.040 5 0.030 0.020 (a) What is the probability that there is exactly one car and exactly one bus during a cycle? 0.020 2 0.025 0.050 0.125 0.150 0.100 0.050 (b) What is the probability that there is at most one car and at most one bus during a cycle? 0.075 (c) What is the probability that there is exactly one car during a cycle? Exactly one bus? P(exactly one car) = 0.220 x P(exactly one bus) = 0.200 (d) Suppose the left-turn lane is to have a capacity of five cars and one bus is equivalent to three cars. What is the probability of an overflow during a cycle? 0.985 x (e) Are X and Y independent rv's? Explain. O Yes, because p(x, y) = P(x) py(y). O Yes, because p(x, y) = Px(x) · P₂(y). No, because p(x, y) = x(x) • py(y). O No, because p(x, y) = P₂(x) • P₂(y). X

MATLAB: An Introduction with Applications
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The joint probability distribution of the number X of cars and the number Y of buses per signal cycle at a proposed left-turn lane is displayed in the accompanying joint probability table.
y
1
p(x, y)
0
1 0.030 0.020
50
X
3 0.090 0.060
4 0.060 0.040
2
0 0.015 0.010 0.025
0.050
2 0.075 0.050 0.125
0.150
0.100
5 0.030 0.020 0.050
(a) What is the probability that there is exactly one car and exactly one bus during a cycle?
0.020
(b) What is the probability that there is at most one car and at most one bus during a cycle?
0.075
(c) What is the probability that there is exactly one car during a cycle? Exactly one bus?
P(exactly one car) = 0.220
x
P(exactly one bus) = 0.200
(d) Suppose the left-turn lane is to have a capacity of five cars and one bus is equivalent to three cars. What is the probability of an overflow during a cycle?
0.985
X
(e) Are X and Y independent rv's? Explain.
O Yes, because p(x, y) = P(x) Py(Y).
O Yes, because p(x, y) = Px(x) • P₂(Y).
#
● No, because p(x, y) = Px(x) • Py(y).
O No, because p(x, y) = px(x) • P₂(y).
X
Transcribed Image Text:The joint probability distribution of the number X of cars and the number Y of buses per signal cycle at a proposed left-turn lane is displayed in the accompanying joint probability table. y 1 p(x, y) 0 1 0.030 0.020 50 X 3 0.090 0.060 4 0.060 0.040 2 0 0.015 0.010 0.025 0.050 2 0.075 0.050 0.125 0.150 0.100 5 0.030 0.020 0.050 (a) What is the probability that there is exactly one car and exactly one bus during a cycle? 0.020 (b) What is the probability that there is at most one car and at most one bus during a cycle? 0.075 (c) What is the probability that there is exactly one car during a cycle? Exactly one bus? P(exactly one car) = 0.220 x P(exactly one bus) = 0.200 (d) Suppose the left-turn lane is to have a capacity of five cars and one bus is equivalent to three cars. What is the probability of an overflow during a cycle? 0.985 X (e) Are X and Y independent rv's? Explain. O Yes, because p(x, y) = P(x) Py(Y). O Yes, because p(x, y) = Px(x) • P₂(Y). # ● No, because p(x, y) = Px(x) • Py(y). O No, because p(x, y) = px(x) • P₂(y). X
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