The other answer is correct, it says "First, find the mean of all of your x-values, and then find the mean of all of your y-values, 28.4 and 214.6 respectively. Afterwards, find the standard deviation of x and y. Then, plug it into the formula for the correlation coefficient."
So R does equal -0.9647
But don't forget to round it to the nearest hundredth, like the question says. I also did the test so I know this answer is correct.
So the answer is -0.96
