Math 221 Study guides, Class notes & Summaries
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Exam (elaborations) DeVry University, Naperville MATH 221 quiz 5(Latest 2023)
- Exam (elaborations) • 19 pages • 2023
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Question 1 
2 / 2 pts 
(CO 4) Consider the following table: 
Age Group Frequency 
18-29 983 
30-39 784 
40-49 686 
50-59 632 
60-69 541 
70 and over 527 
If you created the probability distribution for these data, what would be the probability of 
30-39? 
0.189 
0.237 
0.425 
0.165 
Question 2 
2 / 2 pts 
(CO 4) Consider the following table of hours worked by part-time employees. These 
employees must work in 5 hour blocks. 
Weekly hours worked Probability 
5 0.06 
15 0.61 
20 0.18 
25 0.15 
Fin...
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DeVry University, Naperville MATH 221 Week 3 Quiz (answered correctly)
- Exam (elaborations) • 18 pages • 2023
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Question 1 
0 / 2 pts 
(CO 1) A survey of 385 people who like wild sweaters found that 74% had a wild holiday 
sweater. What is the population and what is the sample? 
Population: people who like wild sweaters: Sample: the 385 people who had a wild 
holiday sweater 
Population: people who like sweaters; Sample: the 74% that had a wild holiday sweater 
Population: people who like wild sweaters; Sample: the 385 people who like wild 
sweaters 
Population: people who like wild sweaters; Sample: the ...
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Math 221 Calculus 1 Exam Review Questions with 100% Correct Answers
- Exam (elaborations) • 2 pages • 2024
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d/dx (log b X) Correct Answer 1/ (X ln(b)) 
 
d/dx (a^x) Correct Answer a^x (ln a ) 
 
d/dx (tan x) Correct Answer sec^2x 
 
d/dx (cot x) Correct Answer -csc^2 x 
 
d/dx (csc x) Correct Answer -csc x * cot x 
 
d/dx (sec x) Correct Answer sec x * tan x 
 
d/dx (arctan x) (TEST) Correct Answer 1/(x^2 + 1) 
 
d/dx (arcsin x) (TEST) Correct Answer 1/ (sqrt (1- x^2)) 
 
d/dx (arcsec x) (TEST) Correct Answer 1/ (sqrt (x( x^2- 1))) 
 
d/dx (sinh x) (TEST) Correct Answer cosh x 
 
d/dx (cosh x) (TEST) ...
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Math 221 Week 2 Homework Quiz (answered correctly)Spring 2023.
- Exam (elaborations) • 11 pages • 2023
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Question 1 
2 / 2 pts 
A student believes that there is a 90% probability of getting an A on the next test. This 
would be considered: 
Manufactured probability 
Classical probability 
Subjective probability 
Empirical probability 
Question 2 
2 / 2 pts 
Given the following information, find the probability that a randomly selected student will 
be very short. Number of students who are very short: 45, short: 60, tall: 82, very tall: 21 
21.0% 
39.4% 
21.6% 
28.8% 
IncorrectQuestion 3 
0 / 2 pts...
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DeVry University, Keller Graduate School of Management_MATH 221Week 7 quiz (Latest 2022/2023)
- Exam (elaborations) • 18 pages • 2023
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Question 1 
2 / 2 pts 
(CO6) From a random sample of 55 businesses, it is found that the mean time that 
employees spend on personal issues each week is 5.8 hours with a standard deviation 
of 0.35 hours. What is the 95% confidence interval for the amount of time spent on 
personal issues? 
(5.74, 5.90) 
(5.73, 5.87) 
(5.72, 5.88) 
Correct! 
(5.71, 5.89) 
Question 2 
0 / 2 pts 
(CO6) If a confidence interval is given from 8.54 to 10.21 and the mean is known to be 
9.375, what is the maximum erro...
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MATH 221 MT 1 EXAM WITH COMPLETE SOLUTION
- Exam (elaborations) • 5 pages • 2023
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MATH 221 MT 1 EXAM WITH COMPLETE SOLUTION 
R^n - CORRECT ANSWERS all ordered n-tuples of real numbers 
 
based vectors - CORRECT ANSWERS a vector v is considered as an arrow from the origin to a point p 
 
Parallelogram Law for Vector Addition - CORRECT ANSWERS If two vectors acting simultaneously at a point can be represented both in magnitude and direction by the adjacent sides of a parallelogram drawn from a point, then the...
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NWEA Math 221-230 Exam Questions With Complete Solution
- Exam (elaborations) • 5 pages • 2023
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NWEA Math 221-230 Exam Questions With Complete Solution 
5-frame - CORRECT ANSWERS 1.Direction 2. Distance 3. Time 4. Origin 5. Axis 
 
absolute value - CORRECT ANSWERS The distance a number is from zero on a number line 
 
algebra - CORRECT ANSWERS the mathematics of generalized arithmetical operations 
 
algebraic equation - CORRECT ANSWERS a number sentence that contains an equal sign and algebraic ex...
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Math 221 Week 2 Homework Quiz (answered correctly)Spring 2023.
- Exam (elaborations) • 11 pages • 2023
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uestion 1 
2 / 2 pts 
The probability of drawing one card and getting queen is 4/52. This would be considered: 
Subjective probability 
Empirical probability 
Manufactured probability 
Classical probability 
IncorrectQuestion 2 
0 / 2 pts 
Given the following information, find the probability that a randomly selected student will be 
very tall. Number of students who are very short: 45, short: 60, tall: 82, very tall: 21 
21.0% 
10.1% 
21.6% 
49.5% 
Question 3 
2 / 2 pts 
Given the following inf...
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MATH 221 week 8 2023 REFLECTION QUESTIONS WITH SOLUTIONS NEW Quiz
- Exam (elaborations) • 6 pages • 2023
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MATH 221 week 8 2023 REFLECTION QUESTIONS WITH SOLUTIONS NEW Quiz
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Math 2210 TOP Exam Questions and CORRECT Answers
- Exam (elaborations) • 25 pages • 2024
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System of Equations: Consistent/Inconsistent Has a solution (or many)= Consistent 
No solution= inconsistent 
Matrices: Echelon Form Requirements 1. All nonzero rows are above zero rows 
2. each leading entry of a row is in a column to the right of the leading entry of the row above 
it 
3. all entries in a column below a leading entry are 0s 
Matrices: Reduced Echelon Form Requirements all 3 of Echelon Form 
4. each leading entry in each nonzero row is a 1 
5. each leading 1 is the only nonzer...
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