I have already created the scatterplot below. I have put the dataset underneath it.

I need to know

A) how to find the correlation coefficient and be able to explain it. I have had no luck in being able to understand the equation, so please be clear so I can always refer back to this.

B) how to find and interpret the coefficient of determination in a way I can understand

C) How can I predict the electric bill using x=65kWh & how much faith one would have in this prediction

Scatterplot of Electric bills in dollars vs Number of KWh 190 180 170 160 Y = Electric bills in dollars 150 140 130 120 35.0 37.5 40.0 42.5 45.0 47.5 X = Number of kWh