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1 Name: Date: PRE-TEST 13 Int roduct ion t o St at ist ics Name Date Period Name: Unit 9: Introduction to Statistics Final Exam Review Interpreting data in a line plot Date: CHAPTER TEST A Complete. Use the data in the line plot. Use the line plot to answer questions 1 to 8. The line plot shows the number of s r eceived by a group of students in a week. Each represents 1 . The line plot shows the number of s received by a group of students in a week. Each represents 1 student. 13 Introduction to Statistics 25 Suggested Time: 30 min Concepts and Skills (5 2 points 10 points) Number of s Use the given data to answer the questions. 1. What is the least number of s r 1. What is the least number of s received by a student? 1. The favorite colors of 20 students are given below. 2. What is the most 2. number What is the most of s number of received s r by a student? Red Green 3. How many students received more than 25 s? 3. How many students received more than 25 s? 4. How many students received less than 23 s? 4. How many students received less than 23 s? Green Green 5. How many s were received by the most number of students? Green 5. How many s were received by the most number of students? 6. How many students are there in all? A tally chart is used to 6. record How the many findings. students are Complete there in all? the table. 7. The number of students who received 22 s is twice the number of 7. The number of students who received 22 s is twice the number of students who r eceived Color Tally Frequency students who received s. Green Red s. 8. The number of students who received s and s is the same. 8. The number of students who received s and Use the given data to answer s is the same. questions. 134 Chapt 13 Pre-Test 9. The table shows the number of children in 25 families. Draw a dot plot to display the data. 2. The table shows the number of children in 25 families. Number of Children Number of Families Draw a dot plot to display the data.
2 Concepts and Skills (5 2 points 10 points) Concepts and Skills (5 2 points 10 points) Use the given data to answer the questions. Use the given data to answer the questions. 1. The favorite colors of 20 students ar e given below. 10. The favorite colors of 20 students are given below. 1. The favorite colors of 20 students ar e given below. Red Green Red Green Green Green Green Green Green Green A tally chart is used to record the findings. Complete the table. A tally chart is used to record the findings. Complete the table. A tally chart is used to record the findings. Complete the table. Color Tally Frequency Color Tally Frequency Green Red Green Red 2. The table shows the number of children in 25 families. Number of Children The table shows the number of childr en in 25 families. Number of Families The table shows the ages of employees in a company. Draw a histogram to display the data. N umber of Children Draw a dot plot to display the data. N umber of Families Draw a dot plot to display the data. 12. The dot plot shows the points obtained by students on a quiz. If a student needed at least 6 points to pass the quiz, how many students passed the quiz? Assessments Course Assessment s Cou
3 13. The histogram shows the number of paper airplanes folded by students in a class. Briefly describe the distribution of the data. Use the table to answer questions 14 to 16. The table shows the masses of 50 eggs. 14. Find the value of x. 15. Draw a histogram to represent the data. 16. An egg with a mass of at least 60 grams is considered large. What percent of the eggs are considered large?
4 Use the data in the dot plot to answer questions 17 to 21. The dot plots shows the results of a survey in which each family was asked how many computer they have. Each dot represents 1 family. 17. What is the median of the data? 18. How many families were surveyed in all? 19. Briefly describe the distribution of the data. 20. Find the total number of computers owned by all the families. 21. What percent of the families did not have a computer? Round your answer to the nearest tenth. Solve 22. The data set shows the number of passengers on eight buses. 29, 33, 41, 38, 42, 37, 36, 40 Find the mean number of passengers. 22. The number of goals scored by a football team in ten matches are 1, 3, 2, 1, 0, 3, 2, 2, 1, 1 Find the mode and median score. 23. The mean of a set of six numbers is 4.5. If the mean of two of the numbers is 5.5, find the mean of the remaining four numbers.
5 Use the data in the dot plot to answer questions 24 to 26. The dot plot shows the results of a survey on the number of hours each student spends playing computer games. 24. Find the modal number of hours each students spends playing computer games. 25. Find the median number of hours each student spends playing computer games. 26. Find the mean number of hours each students spends paying computer games. Use the data set to answer questions 27 to 29. The data set shows the amount of Alvin s monthly savings last year. $7, $12, $10, $12, $15, $11, $8, $9, $11, $11, $13, $ Find Alvin s median monthly savings. 28. Find Alvin s mean monthly savings. 29. If Alvin had saved $1 more every month, what are his new median and new mean monthly savings?
6 Use the data in the table to answer questions 30 to 33. The table shows the shoe sizes of 15 girls. 30. What is the modal shoe size? 31. What is the median shoe size? 32. Find the mean shoe size. 33. Which measure of central tendency best describes the distribution? Use the data in the dot plot to answer questions 34 to 36. The dot plots shows the results of a survey to find the number of mobile phones in 30 families. Each dot represents 1 family. 34. Find the median number of mobile phones. 35. Find the mean number of mobile phones. Round your answer to the nearest tenth. 36. A similar survey is carried out on another 20 families and the mean number of mobile phones is found to be 3.6. If the two data sets are combined, find the mean number of mobile phones in the combined data set.
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