A professor is interested in the average length of books in her library. She has divided her books into a few different categori
2 answers:
Answer:
<h2>21 books approximately.</h2>Step-by-step explanation:
First of all we need to find the proportion of the sample. To do that, we sum all the books and then divide by the sample we need, which is 50
, because we need 50 books among 691 total.
Now, with this ratio, which is the same for all sample we would make here, we find the stratified sample of books, specifically, for sports books which are 290.
Thefore, she should take 21 sports books.
Remember that stratified sampling refers to a type of sampling method where the population is divided into separate groups, which in this case represented the type of books. Then, we use a "probability" sample, or a proportion of the sample to apply it.
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<h2>Explanation:</h2>Here we have the following inequality:
In order to graph the shaded region, we have to graph the equation of the line whose slope is
and y-intercept
. So the graph of the line is shown in the First Figure below.
To find the shaded region we need to have a look at the symbol > that indicates that the shaded region is above the graph of the line and. Since this doesn't include the symbol =, then the line is dotted. Therefore, the resulting region is shown in the second Figure.
<h2>Learn more:</h2>Shaded regions: brainly.com/question/9611462
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