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MrGumby
There is no exact rule for lines of best fit. However, in general, there should be roughly the same amount above as below. So, if we are following this rule, there should be about 4 below as well. 

Answer:

The number of points that should lie below the trend line is:

4.

Step-by-step explanation:

" The general rule of thumb is to have your trend line as close as possible to all data points, and with equal number of points above and below it "

The trend line is also called line of best fit.

It is given that:

When a trend line is drawn on a scatter plot, there are 4 points above the trend line.

Hence, the number of points that should lie below the trend line are:

4.

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