Question

An instructor has given a short quiz consisting of two parts. For a randomly selected student, let X = the number of points earned on the first part and Y = the number of points earned on the second part. Suppose that the joint pmf of X and Y is given in the accompanying table. y p(x, y) 0 5 10 15 x 0 0.03 0.06 0.02 0.10 5 0.04 0.14 0.20 0.10 10 0.01 0.15 0.14 0.01 (a) Compute the covariance for X and Y. (Round your answer to two decimal places.) Cov(X, Y) = (b) Compute ρ for X and Y. (Round your answer to two decimal places.) ρ =

Answer #1

An instructor has given a short quiz consisting of two parts.
For a randomly selected student, let X = the number of
points earned on the first part and Y = the number of
points earned on the second part. Suppose that the joint pmf of
X and Y is given in the accompanying table.
y
p(x, y)
0
5
10
15
x
0
0.03
0.06
0.02
0.10
5
0.04
0.15
0.20
0.10
10
0.01
0.15
0.13
0.01
(a)...

An instructor has given a short quiz consisting of two parts.
For a randomly selected student, let X = the number of
points earned on the first part and Y = the number of
points earned on the second part. Suppose that the joint pmf of
X and Y is given in the accompanying table.
y
p(x,
y)
0
5
10
15
x
0
0.03
0.06
0.02
0.10
5
0.04
0.17
0.20
0.10
10
0.01
0.15
0.11
0.01
(a)...

An instructor has given a short quiz consisting of two parts.
For a randomly selected student, let X = the number of
points earned on the first part and Y = the number of
points earned on the second part. Suppose that the joint pmf of
X and Y is given in the accompanying table.
y
p(x,
y)
0
5
10
15
x
0
0.03
0.06
0.02
0.10
5
0.04
0.16
0.20
0.10
10
0.01
0.15
0.12
0.01
(a)...

An instructor has given a short quiz consisting of two parts.
For a randomly selected student, let X = the number of
points earned on the first part and Y = the number of
points earned on the second part. Suppose that the joint pmf of
X and Y is given in the accompanying table.
y
p(x,
y)
0
5
10
15
x
0
0.01
0.06
0.02
0.10
5
0.04
0.14
0.20
0.10
10
0.01
0.15
0.16
0.01
(a)...

An instructor has given a short quiz consisting of two parts.
For a randomly selected student, let X = the number of
points earned on the first part and Y = the number of
points earned on the second part. Suppose that the joint pmf of
X and Y is given in the accompanying table.
y
p(x,
y)
0
5
10
15
x
0
0.03
0.06
0.02
0.10
5
0.04
0.15
0.20
0.10
10
0.01
0.15
0.13
0.01
(a)...

An instructor has given a short quiz consisting of two parts.
For a randomly selected student, let X represent the number of
points earned on the first part and let Y represent the number of
points earned on the second part. Suppose that the joint pmf of X
and Y is given in the table below. Y 0 5 10 15 0 0.11 0.07 0.05
0.12 X 5 0.07 0.14 0.09 0.07 10 0.06 0.10 0.04 0.08 (a) Calculate
P(X...

A service station has both self-service and full-service
islands. On each island, there is a single regular unleaded pump
with two hoses. Let X denote the number of hoses being
used on the self-service island at a particular time, and let
Y denote the number of hoses on the full-service island in
use at that time. The joint pmf of X and Y
appears in the accompanying tabulation.
y
p(x,
y)
0
1
2
x
0
0.10
0.03
0.01 ...

A service station has both self-service and full-service
islands. On each island, there is a single regular unleaded pump
with two hoses. Let X denote the number of hoses being used on the
self-service island at a particular time, and let Y denote the
number of hoses on the full-service island in use at that time. The
joint pmf of X and Y appears in the accompanying tabulation.
P(X=x,Y=y) Y X 0 1 2 0 0.1 0.04 0.02 1 0.08...

A service station has both self-service and full-service
islands. On each island, there is a single regular unleaded pump
with two hoses. Let X denote the number of hoses being used on the
self-service island at a particular time, and let Y denote the
number of hoses on the full-service island in use at that time. The
joint pmf of X and Y appears in the accompanying tabulation. y p(x,
y) 0 1 2 x 0 0.10 0.03 0.01 1...

A certain market has both an express checkout line and a
super-express checkout line. Let X1 denote the
number of customers in line at the express checkout at a particular
time of day, and let X2 denote the number of
customers in line at the superexpress checkout at the same time.
Suppose the joint pmf of X1 and
X2 is as given in the accompanying table.
x2
0
1
2
3
x1
0
0.08
0.06
0.04
0.00
1
0.04
0.18...

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