1. Use the standard normal table to find the z-score that corresponds to the given percentile. If the area is not in the table, use the entry closest to the area. If the area is halfway between two entries, use the z-score halfway between the corresponding z-scores.
P 90(subscript)
(Round to two decimal places.)
2. Determine whether the random variable is discrete or continuous:
a. The number of textbook authors now sitting at a computer.
b. The amount of rain in City B during April.
c. The amount of snowfall.
d. The number of fish caught during a fishing tournament.
e. The time required to download a file from the internet.