The smaller the spread of scores around the mean:

A) the smaller the variance of the data set.
B) the smaller the standard deviation of the data set.
C) the smaller the coefficient of variation of the data set.
D) All of these choices are true.

The Smythes believe their water meter is not working properly and started keeping track of their meter readings.Mr.Smythe thinks that if he can calculate the amount of water he was charged for using the provider's published piecewise function for water costs and compare it to his own reading,he will know wether meter is working correctly.If their total bill last month was $45.96,how many CCF of water should they have used?