Take Home Test 2 Sta 2023 Worksheet Page 4
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2
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7
820)
Use the
box-and-whisker
plot
below to determine which statement is accurate.
154
265
197.5
",--+-1 -+-1
--+------tlf--r-+
150
175
200
225
250
275
Cholesterol
(in milligrams per deciliter)
A) About
25%
of the adults have cholesterol levels of at most 211.
B) One half of the cholesterol levels are between 180 and
211.
C) About
75%
of the adults have cholesterol levels less than
180.
D) One half of the cholesterol levels are between 180 and
197.5.
21) Find the z-score for the value
55,
when the mean is 58 and the standard deviation is
3.
A) z
=
-1.33
B) z
=
0.90
C) z
=
-0.90
D) z
=
-1.00
22) Test scores for a history class had a mean of 79 with a standard deviation of
4.5.
Test scores for a physics class
had a mean of 69 with a standard deviation of 3.7. Suppose a student gets a 83 on the history test and a 84 on
the physics
test.
Calculate the z-score for each
test.
On which test did the student perform better?
23) The test scores of 30 students are
listed
below. Find
P30.
31 41 45 48 52 55 56
67 67 69 70 70 74 75
80 81 83 85 85 87 90
A) 56
56 63 65
78 79 79
92 95 99
B) 67
C) 63
D) 90
24) In a data set with a minimum value of 54.5 and a maximum value of 98.6 with 300 observations, there are 186
points less than 81.2. Find the percentile for 81.2.
A) 53
B) 62
C) 71
D) 68
25) A student's score on the SAT-1 placement test for
U.S.
history is in the 90th percentile. What can you conclude
about the student's test score?
26) A single six-sided die is
rolled.
Find the probability of rolling a number less than
3.
A)
0.5
B) 0.25
C) 0.1
D)
0.333
27) A study of 1000 randomly selected flights of a major airline showed that 769 of the flights arrived on
time.
What
is the probability of a flight arriving on time?
A) 1000
B) 231
769
1000
C) 1000
231
D) 769
1000
28) If one card is drawn from a standard deck of 52 playing cards, what is the probability of drawing a heart?
A)~
B)~
C)l
O)~
4
2
4
4
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