For Exercises 9-12, show frequency distributions that are incorrectly constructed. State the reasons why they are wrong. Frequency 9. Class 10-19 20-29 30-34 35-45 46-51 0 10. Class Frequency 5-9 9-13 13-17 17-20 20-24

A frequency table of grades has five classes (A,B,C,D,F) with frequencies of 3, 10, 18, 8, and 2 respectively. Using percenatges, what are the relative frequencies of the five classes?  Complete the table.  Grade     Frequency     Relative Frequency  A                     3                          _____ % B                    10                         _____ % C                    18                        _____ % D                     8                        _____ %  F                      2                       _____ % (Round to two decimal places as needed)

Given frequency distribution depicts the scores on a math test. Scores Number of students 60--69 5 70--79 9 80--89 25 90--99 7 Find the class midpoints for class 80--89  Find the class width

7. STATISTICS A class of 32 students participated in running a 400 m race in preparation for their sports day. The time, in seconds, taken by each student is recorded below. 83 34 36 @ (b) 58 82 85 82 81 80 34 82 32 72 98 73 50-54 55-59 60-64 65-69 70-74 75-79 80-84 61 78 71. Copy and complete the frequency table to represent this data. Time in seconds Frequency 3 4 6 Using the raw scores, determine the range for the data. 77887 100

Number 1

1. Find the class midpoints of the first three classes (20-29,30-39, and 40-49) 2. Is the data displayed in the frequency table approximately normal? Explain your reasoning

The table gives some information about the delays (in minutes) of 80 flights. Delay (n minutes) Frequency Cumulative frequency 10 - 19 16 16 20 - 29 26 42 30 - 39 23 40 - 49 10 75 50 - 59 5 80 The number of flights which delayed 39 minutes or less than 39 minutes is:65 flights. true false

describe the steps you would take to construct a frequency distribution

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? Complete the table, starting with the lowest class limit. (Simplify your answers.) Class Frequency Midpoint 11 19 13 12 Relative Frequency 1966 011 13 15 10 8 10 10 16 Cumulative Frequency 6729 U

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