Using the mode concept, according to the stem-and-leaf plot, the missing value is of 71.
What is the mode of the data-set?
It is the value that appears the most times in the data-set.
In this problem, following the key format of the stem-and-leaf plot, disconsidering the missing value, the values 71 and 64 each appear 3 times.
However, the mode is 71, meaning that is should appear more times than 64, which means that the missing value is of 71.
More can be learned about the mode of a data-set at https://brainly.com/question/3747554
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