Using the mean of the data-set, it is found that the missing height in the stem-and-leaf plot is given by:
D. 65 in.
What is the mean?
The mean of a data-set is given by the sum of all observations in the data-set divided by the number of observations.
In this problem, following the key of the stem-and-left plot, there are 8 observations, given as follows:
54, 55, 56, 61, 63, 64, 70 and the missing value x.
The mean is of 61, hence:
[tex]61 = \frac{54 + 55 + 56 + 61 + 63 + 64 + 70 + x}{8}[/tex]
423 + x = 61 x 8
x = 65.
Hence option D is correct.
More can be learned about the mean of a data-set at https://brainly.com/question/24628525
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