Which expression represents the average of three test scores? x + y + z
3 (x + y + z)
StartFraction x + y + z over 3 EndFraction
StartFraction x y z over 3 EndFraction

The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). the mean maximum oxygen uptake for elite athletes has been found to be 60 with a standard deviation of 7.2. assume that the distribution is approximately normal.

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.

Timmy uses 1 1 2 cups of sugar for every 2 gallons of lemonade he makes. how many cups of sugar would timmy use if he makes 13 gallons of lemonade?