My statistics book says there are 8 degrees of freedom for this data set. i don't understand how they got that number? i thought df was n-1?
# of books education level
16
6
6
14
286 9
8
11
18
12
4

The amount of energy it takes to lift a box might be a function of which of the following

Jose predicted that he would sell 48 umbrellas. he actually sold 72 umbrellas. what are the values of a and b in the table below? round to the nearest tenth if necessary

I’m on question 7 it says a covered water tank is in the shape of a cylinder the tank has a 28 inch diameter and a height of 66 inches to the nearest square inch what is the surface area of the water tank