Question

What conclusion can be determined from the dot plot below? A dot plot showing two dots above 6, 7, 8, 9 and 10 each. (3 points) a The number of observations is 5. b The median of the data set is 5. c The mean of the data set is 8. d The range of the data set is 8.

Answer 1

c

Explanation:

Answer 2

C. The mean of the data set is 8.

Explanation:

From the dot plot we can make a frequency table as follows:

Number of books read Frequency

6 2

7 2

8 2

9 2

10 2

Since, the number of dots are 10 or then sum of the frequencies is 10.

Hence, the number of observations are 10.

Also, the median of the set is: 8

Now, the mean is calculated as:

Hence, Mean of the data set is: 8

Now, the range of the data set is the difference between the minimum and the maximum value.

Hence, range=10-6=4

The range of the data set is 4.