The scores on a college entrance test have an approximate normal distribution with a mean, µ = 58 points, and a standard deviation, σ = 9 points.
a. About 68% of the y values lie between what two values? These values are ________________. The z-scores are ________________, respectively.
b. About 95% of the y values lie between what two values? These values are ________________. The z-scores are ________________, respectively.
c. About 99.7% of the y values lie between what two values? These values are ________________. The z-scores are ________________, respectively.