6.1 Exercise 13

The scores on a college entrance exam have an approximate normal distribution with mean, µ = 52 points and a standard deviation, σ = 11 points.

1. About 68 percent of the y values lie between what two values? These values are ________________. The z-scores are ________________, respectively.
2. About 95 percent of the y values lie between what two values? These values are ________________. The z-scores are ________________, respectively.
3. About 99.7 percent of the y values lie between what two values? These values are ________________. The z-scores are ________________, respectively.