Question

2. The raw data from the previous question have been summarized in the following grouped frequency distribution: (18 points) Number of Sit-Ups | Number of students, f | | | ---|---|---|--- 10 to 19 | 7 | | | 20 to 29 | 6 | | | 30 to 39 | 3 | | | 40 to 49 | 8 | | | 50 to 59 | 4 | | | a) Find the mean number of sit-ups for the 28 students from the grouped frequency distribution. Explain or show how you arrived at your answer. (Use the extra columns in the table if needed.) (6 points) b) What is the modal class? (4 points) c) What is the median class? (4 points) d) Why is the mean you calculated in part a) of this question an estimate? (4 points)

          2. The raw data from the previous question have been summarized in the following grouped frequency distribution: (18 points)

Number of Sit-Ups | Number of students, f | | |
---|---|---|---
10 to 19 | 7 | | |
20 to 29 | 6 | | |
30 to 39 | 3 | | |
40 to 49 | 8 | | |
50 to 59 | 4 | | |

a) Find the mean number of sit-ups for the 28 students from the grouped frequency distribution. Explain or show how you arrived at your answer. (Use the extra columns in the table if needed.) (6 points)

b) What is the modal class? (4 points)

c) What is the median class? (4 points)

d) Why is the mean you calculated in part a) of this question an estimate? (4 points)

2. The raw data from the previous question have been summarized in the following grouped frequency distribution: (18 points)

Number of Sit-Ups | Number of students, f | | |
—|—|—|—
10 to 19 | 7 | | |
20 to 29 | 6 | | |
30 to 39 | 3 | | |
40 to 49 | 8 | | |
50 to 59 | 4 | | |

a) Find the mean number of sit-ups for the 28 students from the grouped frequency distribution. Explain or show how you arrived at your answer. (Use the extra columns in the table if needed.) (6 points)

b) What is the modal class? (4 points)

c) What is the median class? (4 points)

d) Why is the mean you calculated in part a) of this question an estimate? (4 points)

Added by Marina C.

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