Consider the following frequency table representing the distribution of hours students study for an exam in a week. Determine the class width of each class. Hours Students Study for an Exam in a Week Class 20-28 29-37 38-46 47-55 56-64 Frequency 14 2 12 3 11

26 14 30 45 20 21 27 32 40 Age of residents in a neighbourhood 50 9 37 40 36 13 Create a relative frequency polygon for the data 52 10 35 12 36 57 28 51 47 48 42 42 52 1 53

Recall that a relative frequency histogram is used to graph quantitative data. Classes are chosen to divide the range of values into equal-length subintervals, then plotted along the horizontal axis. A bar is drawn for each class with height equal to the relative frequency for that class. To create a relative frequency histogram, first summarize the following data in a frequency table. 1 N 2 3 4 5 6 7 Class Class Boundaries 8 9 1.3 10 11 14.7 9.0 16.7 4.1 14.9 4.4 2.7 32.3 10.9 9.0 9.0 1.6 18.4 1.0 2.4 2.4 18.0 Since the measurements are all between the values 0 and 33, it will be convenient to choose 11 class intervals of length 3. Using the given data, tally the values within each class interval to determine the frequency of each class, and fill in the following table. 0 to <3 3.5 11.2 18.0 26.7 3.7 3 to 6 6 to 9 9 to 12 12 to < 15 15 to 18 18 to 21 21 to 24 24 to 27 0.2 6.1 13.5 27 to < 30 30 to 33 7.4 8.2 19.2 1 1 2 1 Frequency 10 5 1 4 1 X X 9.4 X 8.7 X 2.0 6.6 3.9 5.9 4.3 3.3 0.2…

A frequency table of grades has five classes (A, B, C, D, F) with frequencies of 5, 13, 16, 4, and 3 o respectively. Using percentages, what are the relative frequencies of the five classes? Complete the table. Grade Frequency Relative frequency. A % 13 % 16 4. F. (Round to two decimal places as needed.) BCD

During one shift, the express lane clerk recorded how many times customers violated the "10 items or less" rule for his lane. In particular, he recorded how many items over the limit each violator placed on the conveyor belt. This data is summarized in the histogram below. NOTE: The last class actually represents "7 or more items," not just 7 items. Frequency SHIFT 14- 12 10- 8- 6 CAPS 0.5 1.5 2.5 3.5 4.5 5.5 5.5 6.5 7.5 #items over 10 Q What is the frequency of times the limit was exceeded by at least 2 items? 38°F Clear 4 ans 2H TAB 61 Check Answer ESC ! F1 ! Q A Z BEBEEEE F2 X 2 W S F3 # * 3 Q Search X E F4 LA 4 F5 с % R 5 LLI F6 T V 6 HCO F7 1111 4+ 7 Y F8 G H * 00 с F9 J B N

Proc Freq of the SAS System produced a data of 4 different zip codes (zip codes 1-4) that has most homes for sale. Zip code 1 has 6, zip code 2 has 13, zip code 3 has 16, and zip code 4 has 34. Complete the relative     frequency distribution.  Zip         Relative Frequency 1                   % 2                   % 3                  % 4                  %

A frequency table of grades has five classes (A, B, C, D, F) with frequencies of 2, 15, 18, 4, and 2 respectively. Using percentages, what are the relative frequencies of the five classes? Complete the table. Grade Frequency Relative frequency A 2 % B 15 % 18 D 4 % F 2 % (Round to two decimal places as needed.)

The frequency distribution to the right shows the various levels of demand for a particular laptop computer sold by a store during the last 50 business days. Determine the average number of laptops sold per day. Number of Laptops    Frquency 0                                    251                                     52                                     63                                    114                                     15                                     2

Ms. Garcia gave her students a biology test last week. Here are the test scores for each of the sixteen students. 83 79 78 82 77 81 Test scores 80 78 Send data to calculator Test scores 71.5 to 75.5 75.5 to 79.5 79.5 to 83.5 (a) Complete the grouped frequency distribution for the data. (Note that the class width is 4.) 83.5 to 87.5 87.5 to 91.5 86 X 90 85 74 84 74 73 89 Frequency S (b) Using the classes from part (a), draw the frequency polygon for the data. Note that you can add or remove classes from the figure. Label each class with its midpoint. Frequency 4+ 3+ 2+ L Test scores 0:00 00:0 X ? 10 A 8 Aa

The data represent the​ time, in​ minutes, spent reading a political blog in a day. Construct a frequency distribution using 5 classes. In the​ table, include the​ midpoints, relative​ frequencies, and cumulative frequencies. Which class has the greatest frequency and which has the least​ frequency? 20     22    29    2     3 19     19    4      10   20 29     13     25    17    28 22     4       13     0      9