30s-18 is the answer jus add all the sides together/ add the like terms then solve it
Lol, I'm just answering that question right now. I haven't turned it in yet, but I believe the answer is true as all the sides of an equilateral triangle are equal.
Considering the given box-and-whisker plot, it is found that the bookstore sold between 2 to 12 books in 20 days.
<h3>What does a box-and-whisker plot shows?</h3>
A box and whisker plot shows three things:
- The 25th percentile, which is the median of the bottom 50%.
- The median, which splits the entire data-set into two halfs, the bottom 50% and the upper 50%.
- The 75th percentile, which is the median of the upper 50%.
From the plot given in this problem, the have that:
- The 25th percentile is of 2.
- The 75th percentile is of 12.
This means that the percentage of days in which between 2 to 12 books were sold is:
P = 75 - 25 = 50%.
Hence, out of 40 days, the amount of days is:
0.5 x 40 = 20 days.
More can be learned about box-and-whisker plots at brainly.com/question/27721471
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Answer:
The 99% confidence interval of the standard deviation of the pulse rates of men is
![[ 7.949 \ \ , \ 14.387 ]](https://tex.z-dn.net/?f=%5B%207.949%20%5C%20%20%5C%20%2C%20%5C%20%2014.387%20%5D)
Step-by-step explanation:
From the question we are told that
The sample size is n = 40
The mean is 
The standard deviation is 
Generally the degree of freedom is mathematically represented as

=> 
=> 
From the question we are told the confidence level is 99% , hence the level of significance is

=> 
Generally from the chi distribution table the critical value of at a degree of freedom of is

Generally from the chi distribution table the critical value of at a degree of freedom of is

Generally the 99% confidence interval of the standard deviation of the pulse rates of men is mathematically represented as

=> 
=> ![[ 7.949 \ \ , \ 14.387 ]](https://tex.z-dn.net/?f=%5B%207.949%20%5C%20%20%5C%20%2C%20%5C%20%2014.387%20%5D)