Two data sets, X and Y, each consist of 20 integers and are summarized in the histograms shown. For each histogram, the first interval represents the frequency of integers greater than or equal to 20 but less than 30, the second interval represents the frequency of integers greater than or equal to 30 but less than 40, and so on.
Data Set X:
Interval [20,30): Frequency 5
Interval [30,40): Frequency 10
Interval [40,50): Frequency 5
Data Set Y:
Interval [10,20): Frequency 5
Interval [20,30): Frequency 10
Interval [30,40): Frequency 5
What is the smallest possible difference between the mean of data set X and the mean of data set Y?
0
1
10
20
