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2 years ago

Naomi drew lines of best fit for two scatter plots, as shown.

Mathematics

2 answers:

9966 [12]2 years ago

8 0

Answer:

B. Only line B is a well-placed line of best fit.

Step-by-step explanation:

A line of best fit is a line that represents the data points the best. It doesn't necessarily mean always running through all the points, but the distance between the points on the scatter plot and the line should be approximately the same.

Look at the graphs.

- Line A: sure, it runs through 2 points, but all the other points are below the line, showing that A doesn't represent this data well.

Line B: it's true that the line doesn't run through any of the points, but the data are very close to the line with similar distances.

Thus, only B is well-placed.

serg [7]2 years ago

4 0

Answer:

Step-by-step explanation:

There are some points above and some below the line in B, making it a good fit

But in A, most of the points are below the line

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2 years ago

The tensile strength of silicone rubber is thought to be a function of curing temperature. A study was carried out in which samp

lianna [129]

Answer:

Sample mean tensile strength for 20°C $\bar X_{20} =2.11$ Mp

Sample mean tensile strength for 45°C $\bar X_{45} =2.235$ Mp

Step-by-step explanation:

A dot plot for combined data allows comparison between the responses of an experiment to two or more independent factors. In this case there are 12 experimental observations of tensile strength on silicone rubber for two levels of the curing temperature factor (30°C and 45°C)

The sample mean can be calculated by:

$\bar X_{20} = \frac{1}{n}\sum{x_i}=2.11$ Mp

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The dot plot can be observed in the attached file.

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2 years ago

Rachel earned $54.79 last week. Morgan earned $50.23. About how much more did Rachel earn

Natali [406]

Answer:

105.2

Step-by-step explanation:

54+50=104

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104+1.02=105.2

Hope this helps.

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2 years ago

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tia_tia [17]

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2 years ago

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Answer:

Step-by-step explanation:

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"per gallon" means per 1 unit of gallon, which we will get ONLY IF WE DIVIDE by TOTAL NUMBER OF GALLONS, hence we get "per unit of gallon".

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Answer choice D is right.

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2 years ago