19. Shown here is a frequency distribution for the number of inches of rain received in 1 year in selected cities in the United States. Number of inches Frequency 5.5-20.5 20.5–35.5 3 35.5–50.5 8 50.5–65.5 6 65.5–80.5 3 80.5–95.5 3 Find the standard deviation. а. 20.82 b. 21.25

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