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Stem_and_leaf

Above is the stem-and-leaf display for a group of test scores. Which of the following scores would come closest to being at the 70th percentile?

CORRECT

The stem-and-leaf display represents 53 scores. The score at the 70th percentile would be the score that is greater than 70% of the 53 scores, or

$53 \times 0.70 \approx 37$ scores.

We count up 38 scores from the bottom:

Stem_and_leaf_2

The 38th-lowest score is 78, which is the correct choice.