SAT Question 9110c120: Distributions, Center & Spread answer and explanation with Desmos solution

Choice A is correct. The mean of a data set is the sum of the values divided by the number of values. The mean of data set A is $\frac{45}{9}$, or $5$. The mean of data set B is $\frac{145}{10}$, or $14.5$. Thus, the means are different. The median of a data set is the middle value when the values are ordered from least to greatest. The medians of data sets A and B are both $5$. Therefore, the medians are the same, so only the means are different.