Look at the standard normal distribution in Figure 1.4 to answer the following questions:
a. Approximately what proportion (or percentage) of scores in a normal distribution lie within a range from -2σ below the mean to +1σ above the mean?
b. Approximately what percentage of scores lie above +3σ?
c. What percentage of scores lie inside the range -2σ below the mean to +2σ above the mean? What percentages of scores lie outside this range?