On the first 7 statistics tests of the semester, Jamal scored 61, 76, 79, 80, 80, 84, and 91. The mean, median, and mode of his scores were 79, 80, and 80, respectively. On the 8th statistics test, Jamal scored 90. How do the mean, median, and mode of all 8 of his scores compare to the mean, median, and mode of his first 7 scores?

$$ \begin{array}{l c c c} &\text{Mean} & \text{Median} & \text{Mode} \\ \hline \textbf{A.} & \text{equal} & \text{greater} & \text{greater} \\ \textbf{B.} & \text{greater} & \text{greater} & \text{greater} \\ \textbf{C.} & \text{greater} & \text{greater} & \text{equal} \\ \textbf{D.} & \text{greater} & \text{equal} & \text{greater} \\ \textbf{E.} & \text{greater} & \text{equal} & \text{equal} \end{array} $$

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Comparing the data sets:

$$ 61, 76, 79, 80, 80, 84, 91 $$ $$ 61, 76, 79, 80, 80, 84, \color{red} 90\color{black}, 91 $$

The median and mode for both sets remain the same, at 80. The mean for the second set increases since 90 is relatively large number compared to the rest.