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Estimating slope of line of best fit


Liz's math test included a survey question asking how many hours students spent studying for the test. The scatter plot below shows the relationship between how many hours students spent studying and their score on the test.
Which of the following is the best estimate of the average score change associated with a 1 hour increase in study time?
Choose 1 answer:
A scatterplot plots points x y axis. The y axis is labeled Score. The x axis is labeled Study time in hours. Points rise diagonally in a relatively narrow pattern including points around (0, 20) and (1, 40). All values estimated.