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nirvana33 [79]
3 years ago
12

The scatterplot shows the ages and values of cars that residents in a neighborhood own. A graph titled Values of Cars has age of

car (years) on the x-axis and Value of car (thousands of dollars) on the y-axis. Points are grouped together and decrease. Point (10, 15) is above and to the right of the cluster. Which statement about the scatterplot is true? The point (10, 15) shows there is no relationship between the age of a car and the value of a car. By excluding (10, 15), a better description can be given for the data set. By including (10, 15), the description of the data set can be understated. Although (10, 15) is an extreme value, it should be part of the description of the relationship between the age of a car and the value of the car.
Mathematics
2 answers:
kiruha [24]3 years ago
8 0

Answer:

C.By including (10, 15), the description of the data set can be understated.

inysia [295]3 years ago
5 0

Answer:C

Step-by-step explanation:

Just c

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Step-by-step explanation:

Since this is a normal distribution, we want the value of the mean, μ:  2.2; and the value of the standard deviation, σ:  6.3.

For the 40th percentile, we look in a z chart.  We want to find the value as close to 0.40 as we can get; this is 0.4013, and it corresponds to a z score of z = -0.25.

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Multiply both sides by 6.3:

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Add 2.2 to each side:

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For the 99th percentile, the value in the z chart closest to 0.99 is 0.9901, which corresponds to a z score of z = 2.33:

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Multiply both sides by 6.3:

6.3(2.33) = X-2.2

14.679 = X-2.2

Add 2.2 to each side:

14.679+2.2 = X-2.2+2.2

16.879 = X

For the IQR, we find the values for the 75th percentile (Q3) and the 25th percentile (Q1).  The value in a z chart closest to 0.75 is 0.7486, which corresponds to a z score of z = 0.67:

0.67 = (X-2.2)/6.3

Multiply both sides by 6.3:

6.3(0.67) = X-2.2

4.221 = X-2.2

Add 2.2 to each side:

4.221+2.2 = X-2.2+2.2

6.421 = X

The value in a z chart closest to 0.25 is 0.2514, which corresponds to a z score of z = -0.67:

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Multiply both sides by 6.3:

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-4.221 = X-2.2

Add 2.2 to each side:

-4.221+2.2 = X-2.2+2.2

-2.021 = X

This makes the interquartile range

6.421--2.021 = 8.442

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