The document discusses three key meanings of the shaded area under a normal curve between two z-scores: 1) it represents an area under the normal curve, 2) a percentage of values in a data set that fall between the two z-scores, and 3) a probability that a particular z-score will fall between the two given z-scores. It then provides an example of an orange producer who sorts oranges into small, jumbo, and regular categories based on size and sells them at different prices, with the diameters of oranges following a normal distribution with a mean of 84mm.

1. Homework
Review
Summer Stats by Letting Go of Control

2. The 3 meanings of a Shaded Normal Curve
z low z high
The shaded area under a normal curve between two z-scores is
interpreted, simultaneously, as:
• an area
(the area under the normal curve)
• a percentage
(the percentage of all values in a data set that lie between two
particular z-scores)
• a probability
(the probability that a particular z-score falls between two
given z-scores)