Biologists have observed that the chirping rate of crickets of a certain species appears to be related to temperature. The table shows the chirping rates for various temperatures.

(a) Make a scatter plot of the data.
(b) Find and graph the regression line.
(c) Use the linear model in part (b) to estimate the chirping rate at 100oF.

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Temperature ("F) Chirping rate (chirps/min) 50 20 55 46 79 60 65 91 70 113 140 173 75 80 198 85 90 211