Exercise 7.2 The reaction times for a random sample of 9 subjects to a stimulant were recorded as 2.5, 3.6, 3.1, 4.3, 2.9. 2.3, 2.6, 4.1, and 3.4 seconds. Find a. the range b. the standard deviation c. the variance.

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A: Solution:1:2: