Answer:
The statement which is true about the dot plot is:
D) set B has the greater range.
Explanation:
Set A--
- We see that set A is slightly symmetric about the data point 40.
- Hence, the median of the set is: 40
- Also, the mean is calculated as follows:

and Maximum value=60
Hence, Range= Maximum value-Least value
i.e. Range= 60-20
Range= 40
Set B--
and there are total 16 data points
- and the median of data is: 30.
- Also, the mean is calculated as follows:

- Minimum value or least value= 10
and Maximum value= 60
Hence, Range= 60-10
Range= 50
Set B has less mean as compared to set A
( Hence, option: A is incorrect)
Also, the median of set B is less than the median of set A.
( Hence, option: B is incorrect)
Also, set A is more symmetric than set B.
( Hence, option: C is incorrect)
Set B has greater range than set A
( since Range of set B=50
and Range of set A= 40 )