The coefficient of variation is 20%
The lower limit is 9 and the upper limit is 21
Given the following parameters
The coefficient of variation is expressed as:
coefficient of variation = s/x * 100
coefficient of variation = 3/15 * 100
coefficient of variation = = 20%
Hence the coefficient of variation is 20%
The formula for the Chebyshev interval is given as:
[tex](x- 3k, x + 3k)[/tex]
Get the value of k using the formula below:
[tex]0.75=1-\frac{1}{k^2}\\ 0.25 = \frac{1}{k^2} \\k^2= \frac{1}{0.25} \\k = 2[/tex]
Get the required interval
[tex](15- 3(2), 15 + 3(2))\\(9,21)[/tex]
Hence the lower limit is 9 and the upper limit is 21
Learn more on confidence intervals here: https://brainly.com/question/15712887
