Name MTH 139 Practice Exam 1 arertice exam is not comprehensive. You should stil
ID: 3073957 • Letter: N
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Name MTH 139 Practice Exam 1 arertice exam is not comprehensive. You should still review homework problems The histogram below gives the one way commute time to work for a sample of employees. Use it to answer questions 5-8 5. How many employees were in the sample? 6. How many employees took 28 minutes or more to get to work? frequency What percentage of employees took less than 20 minutes to get to work? 7. 4 1220 28 3 44 48 one Way Times lin minutes) 8. Is it possible to find the number of employees that took 15 minutes to get to work? If so, find it. If not, explain why The stem and leaf plot gives the number of individual species observed by scientists over the course of a year. Use it to answer questions 9-11 15 23367 16 0022367 17 578 18 136 19 20 66 21 22 8 9. How many scientist's counts are represented in this data? 10. What is the general shape of this distribution? (ie, symmetric, left skewed, or right skewed) 11. What was the highest number of species observed by a scientist? 12. Suppose a class takes a very difficult pop quiz. Would you expect the scores of the quiz to be symmetric, right-skewed, or left-skewed? Explain your reasoning.Explanation / Answer
5) number of employees in sample =8+6+3+2+1 =20
6)
number of employees that took more than 28 minutes =2+1 =3
7)
number of employees that took less than 20 minutes =8+6 =14
hence % of employees that took less than 20 minutes =(14/20)*100=70%
8)
No as histogram does not provide frequency on an individual data point but distribution on an interval of values
9)
total units in sample =5+7+3+3+2+1=21
10) right skewed as extreme values are in the right tail of distribution
11)
highest number =228
12)
fr a difficult quiz the distribution will be right skewed as most of people who are underprepared will have theitr score concentrated in lower score interval while some people who have prepared good for the exam will get higher score.
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