Answer:
At least 75% of the observations lie between 16 and 28.
Step-by-step explanation:
The Chebyshev’s Theorem says:
For any numerical data set, at least of the data lie within k standard deviations of the mean, that is, in the interval with endpoints for populations, where k is any positive whole number that is greater than 1.
Given:
The interval (16, 28) is the one that is formed by adding and subtracting two standard deviations from the mean.
For k = 2, we see that , which is 75% of the data must always be within two standard deviations of the mean.
At least 75% of the observations lie between 16 and 28.