Unit 2 Quiz Answer Key

Unit
2
Quiz
Assume
a
random
variable
representing
the
amount
of
time
it
takes
for
a
customer
service
representative
to
pick
up
has
a
uniform
distribution
between
15
and
20
minutes.
What
is
the
probability
that
a
randomly
selected
application
from
this
distribution
took
less
than
18
minutes?
-
ANS-0.6
Suppose
at
the
shooting
range
you
have
a
probability
of
hitting
the
bullseye
on
your
target
of
about
10%.
A)
What
is
the
probability
of
hitting
the
bullseye
exactly
1
time
in
20
shots?
-
ANS-0.2702
Suppose
at
the
shooting
range
you
have
a
probability
of
hitting
the
bullseye
on
your
target
of
about
10%.
B)
What
is
the
probability
of
hitting
the
bullseye
more
than
1
time
in
20
shots?
-
ANS-0.6083
Suppose
at
the
shooting
range
you
have
a
probability
of
hitting
the
bullseye
on
your
target
of
about
10%.
C)
What
is
the
mean
number
of
bullseye's
you
would
expect
in
20
shots?
-
ANS-2
Suppose
at
the
shooting
range
you
have
a
probability
of
hitting
the
bullseye
on
your
target
of
about
10%.
D)
What
is
the
Standard
Deviation
of
bullseye's
you
would
expect
in
20
shots?
-
ANS-1.3416
Suppose
Students'
scores
on
the
SAT
are
normally
distributed
with
μ=
1509
and
σ=
321
A)
What
percentage
of
a
students
score
less
than
1188?
(An
approximate
answer
is
fine
here)
-
ANS-16
Suppose
Students'
scores
on
the
SAT
are
normally
distributed
with
μ=
1509
and
σ=
321
B)
What
percentage
of
a
students
score
between
867
and
2151?
(An
approximate
answer
is
fine
here)
-
ANS-95
Suppose
Students'
scores
on
the
SAT
are
normally
distributed
with
μ=
1509
and
σ=
321
C)
Find
the
probability
of
a
student
scoring
more
than
1600
-
ANS-0.3884