Well you technically need 3 dimensions and know the shape of the pool if you gave me that i could help you!!<span />
We can see from the given numbers in the data that there is an outlier. This means that mean or average is not a good measure of center. Also, there is no repeating number to give us the mode of the given. The answer is therefore, median is the only appropriate measure of center.
Answer:
She spent 17 books
Equation: 45+6 = 51 and 51/3 = 17 books
B I’m guessing, never really worked with something like this before though