Add and simplify.20(Type an integer or a simplified fraction.)

Mathematics

1 answer:

erik [133]3 years ago

7 0

$-\dfrac{7}{20}+\left(-\dfrac{9}{20}\right)=\dfrac{-7}{20}+\dfrac{-9}{20}=\dfrac{-7+(-9)}{20}=\dfrac{-16}{20}=-\dfrac{16:4}{20:4}=\boxed{-\frac{4}{5}}$

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Describe the center and spread of the data using either the mean and standard deviation or the five-number summary. Justify your

goblinko [34]

Answer:

The distribution is skewed, so use the five-number summary. range: 38, median: 16, half of the data are between 9.5 and 25

Step-by-step explanation:

In the picture attached the histogram is shown. We can see that data is skewed to the right, so we have to use the five-number summary. The range of the data is 39 - 1 = 38 (subtraction of the maximum value to the minimum value); the median is (15 + 17)/2 = 16 (if you order the values, 15 and 17 are in the middle); quartile 1 is 9.25 and quartile 3 is 25.5 (see diagram of box and whisker attached), then half of the data are between those values.