The frequency distribution shows the number of pets owned by students in Mr. Jon

Question

The frequency distribution shows the number of pets owned by students in Mr. Jones’ kindergarten class.

X (number of pets)

f (frequency)

Relative frequency

0

4

.13

1

12

.40

2

8

.27

3

2

.07

4

1

.03

5

2

.07

6

1

.03

                What is the total number of students in Mr. Jones’s class?

Refer to the previous frequency distribution of number of pets. How many students in the class had less than 3 pets?

A   16

B   20

C   24

D   26

A researcher asked 60 students how many hours they slept the previous night. The frequency distribution of the hours slept is shown below:

X (hours)

f (frequency)

Relative frequency

0 - 1

5

.08

2 - 3

15

.25

4 - 5

19

.32

6 - 7

15

.25

8 - 9

5

.08

10-11

1

.02

What percentage of students slept between 4 and 7 hours?

Refer to the frequency distribution in the previous question. What are the real limits of the last interval?

You ask 40 people to select their favorite TV channel from 4 options. The results show that each of the 4 channels is equally preferred. This is an example of a____________________

A. Normal distribution

B. Uniform distribution

C. Positively skewed distribution

D. Negatively skewed distribution

The sum of all relative frequencies in a frequency distribution will always add up to 1.

A True

B   False

A distribution of scores on a biology test shows a greater concentration on the lower end with a few extreme scores on the high end. This is an example of a(n) ________ skewed distribution.

A. Positively

B. Evenly

C. Negatively

D. Discretely

A basketball coach records the following data from his team: height (inches); weight (pounds) and year of study (freshman, sophomore, junior, senior). The height of the team would be best summarized by (select all that apply) :

A. Line graph

B. Histogram

C. Bar graph

D. Pie chart

Referring to the previous question, the weight of the players would be best summarized by (select all that apply):

A. Line graph

B. Histogram

C. Bar graph

D. Pie chart

Referring to the previous question, the players’ year of study would be best summarized by (select all that apply):

A. Line graph

B. Histogram

C. Bar graph

D. Pie chart

X (number of pets)

f (frequency)

Relative frequency

0

4

.13

1

12

.40

2

8

.27

3

2

.07

4

1

.03

5

2

.07

6

1

.03

Explanation / Answer

1)total number of students in Mr. Jones’s class =total frequency =4+12+8+2+1+2+1=30

2)students in the class had less than 3 pets =4+12+8 =24

3) percentage of students slept between 4 and 7 hours =(sum of relative frequency)*!00 ==- =(0.32+0.25)*100=57%

4)This is an example of equal probability hence uniform distribution

5)The sum of all relative frequencies in a frequency distribution will always add up to 1

6)This is an example of a(n) postively skewed distribution.

7)

A basketball coach records the following data from his team: height (inches); weight (pounds) and year of study (freshman, sophomore, junior, senior). The height of the team would be best summarized by (select all that apply) :Histogram

8)Referring to the previous question, the weight of the players would be best summarized by (select all that apply):Bar graph

9), the players’ year of study would be best summarized by (select all that apply):

Histogram

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