Questions
13
—
16
refer
to
the
following:
The
weather
on
a
tropical
island
in
January
is
fairly
constant.
Records
indicate
that the
high
temperatures
for
each
day
of
the
month
tend
to
have
a
uniform
distribution
over
the
interval
from
75°F
to
90°F.
A
tourist
arrives
on
the
island
on
a
randomly
selected day
in
January.
13.
Find
the
probability
that
the
temperature
will
be
above
80°F.
A.
0.6667
B.
0.3337
C.
0.8889
D.
0.9375
14.
Find
the
interquartile
range
of
temperatures.
A.
375°F
B.
7.5°F
C.
15°F
D.
30°F
15.
Interpret
the
70th
percentile.
A.
70%
of
temperatures
will
be
at
least
85.5°F.
B.
70%
of
temperatures
will
be
at
most
85.5°F.
C.
70%
of
temperatures
will
be
at
least
79.5°F.
D.
70%
of
temperatures
will
be
at
most
79.5°F.
16.
Suppose
data
are
collected
for
a
random
sample
of 25
days.
Find
the
distribution
for
the
average
high
temperature
for
the
25
days
in
the
sample.
A.
U
(82.5,4.33)
B.N(82.5,4.33)
C.
N(82.5,
0.87)
D.
U(82.5,
0.87)
17.
Huey,
Dewey,
and
Louie
participated
in
races
in
different
winter
sports.
Below
are
each
person’s
time,
and
the
average
time
and
standard
deviation
for
all
racers
in
her
race.
‘Who
did
the
best
in
her
own
race
as
compared
to
the
other
racers
participating
in
their
own
races?
Race
Racer
Time
Average
Time
p
forall
|
Standard
Deviation
¢
for
(minutes)
racers
in
this
race
all
racers
in
this
race
Downhill
Skiing
Huey
4.5
4.0
0.5
Snowshoeing
Dewey
6.3
6.0
0.4
Snowboarding
Louie
3.8
3.5
0.6
A.
Huey
B.
Dewey
C.
Louie
D.
All
performed
the
same
18.
Find
the
standard
deviation
of
the
following
graph.
