BSTAT 2305 FINAL LATEST
EXAM
The following histogram represents the number of pages in each book
within a collection. What is the frequency of books containing at least
250 but fewer than 400 pages? - ANSWERS-11
Add the frequencies, 7, 3, and 1, for the classes 250 up to 300, 300 up to
350, and 350 up to 400.
The accompanying relative frequency distribution represents the last
year car sales for the sales force at Kelly's Mega Used Car Center.
Car Sales - Relative Frequency
35 up to 45 - 0.07
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PAGE
1
, BSTAT 2305 FINAL LATEST
EXAM
45 up to 55 - 0.15
55 up to 65 - 0.31
65 up to 75 - 0.22
75 up to 85 - 0.25
If Kelly's employs 100 salespeople, how many of these salespeople have
sold at least 65 cars in the last year? - ANSWERS-47
(0.22 + 0.25)100 = 47 employees.
The number of cars sold by a car salesperson during each of the last 25
weeks is the following:
Number Sold - Frequency
0 - 10
1 - 10
2-5
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PAGE
2
, BSTAT 2305 FINAL LATEST
EXAM
What is the probability that the salesperson will sell one car during a
week? - ANSWERS-0.40
P(X = 1) = 10/25 = 0.40
Consider the following discrete probability distribution.
x - P(X = x)
-10 - 0.35
0 - 0.10
10 - 0.15
20 - 0.40
What is the probability that X is less than 5? - ANSWERS-0.45
P(X < 5) = P(X = −10) + P(X = 0) = 0.35 + 0.10 = 0.45
The director of graduate admissions is analyzing the relationship
between scores in the GRE and student performance in graduate school,
END OF
PAGE
3
, BSTAT 2305 FINAL LATEST
EXAM
as measured by a student's GPA. The table below shows a sample of 10
students. - ANSWERS-The correlation between GRE and GPA is
positive and strong.
=CORREL(<GRE data>,<GPA data>) = 0.894
There are 30 Major League Baseball teams in the National League. Five
of these teams will make the playoffs at the end of the season. The
number of unique groups of teams that can make the playoffs is ______.
- ANSWERS-142,506
In Excel, the function used is =COMBIN(30,5) = 142,506
The number of homes sold by a realtor during a month has the following
probability distribution:
Number Sold - Probability
0 - 0.20
1 - 0.40
2 - 0.40
END OF
PAGE
4
EXAM
The following histogram represents the number of pages in each book
within a collection. What is the frequency of books containing at least
250 but fewer than 400 pages? - ANSWERS-11
Add the frequencies, 7, 3, and 1, for the classes 250 up to 300, 300 up to
350, and 350 up to 400.
The accompanying relative frequency distribution represents the last
year car sales for the sales force at Kelly's Mega Used Car Center.
Car Sales - Relative Frequency
35 up to 45 - 0.07
END OF
PAGE
1
, BSTAT 2305 FINAL LATEST
EXAM
45 up to 55 - 0.15
55 up to 65 - 0.31
65 up to 75 - 0.22
75 up to 85 - 0.25
If Kelly's employs 100 salespeople, how many of these salespeople have
sold at least 65 cars in the last year? - ANSWERS-47
(0.22 + 0.25)100 = 47 employees.
The number of cars sold by a car salesperson during each of the last 25
weeks is the following:
Number Sold - Frequency
0 - 10
1 - 10
2-5
END OF
PAGE
2
, BSTAT 2305 FINAL LATEST
EXAM
What is the probability that the salesperson will sell one car during a
week? - ANSWERS-0.40
P(X = 1) = 10/25 = 0.40
Consider the following discrete probability distribution.
x - P(X = x)
-10 - 0.35
0 - 0.10
10 - 0.15
20 - 0.40
What is the probability that X is less than 5? - ANSWERS-0.45
P(X < 5) = P(X = −10) + P(X = 0) = 0.35 + 0.10 = 0.45
The director of graduate admissions is analyzing the relationship
between scores in the GRE and student performance in graduate school,
END OF
PAGE
3
, BSTAT 2305 FINAL LATEST
EXAM
as measured by a student's GPA. The table below shows a sample of 10
students. - ANSWERS-The correlation between GRE and GPA is
positive and strong.
=CORREL(<GRE data>,<GPA data>) = 0.894
There are 30 Major League Baseball teams in the National League. Five
of these teams will make the playoffs at the end of the season. The
number of unique groups of teams that can make the playoffs is ______.
- ANSWERS-142,506
In Excel, the function used is =COMBIN(30,5) = 142,506
The number of homes sold by a realtor during a month has the following
probability distribution:
Number Sold - Probability
0 - 0.20
1 - 0.40
2 - 0.40
END OF
PAGE
4
