Shown here is a frequency distribution for the rise in tides at 30 selected locations in the

Question:

Shown here is a frequency for the rise in tides at 30 selected locations in the United States.
Rise in tides (inches) Frequency
12.5–27.5 ..........6
27.5–42.5 ..........3
42.5–57.5 ..........5
57.5–72.5 ..........8
72.5–87.5 ..........6
87.5–102.5 ...........2
a. Mean
b. Modal class
c. Variance
d. Standard deviation Distribution
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