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Math·Problem-Solving and Data Analysis·One-variable data: Distributions and measures of center and spread

hard

Data set A contains 24 integers, all in the interval $10\le x<20$. Data set B contains 24 integers, all in the interval $30\le x<40$. What is the smallest possible difference between the mean of data set B and the mean of data set A?

A

10

B

11

C

20

D

21