The reaction times for a random sample of 9 subjects to a stimulant were recorded as shown below. 4.7 2.4 4.3 3.5 4.1 2.5 4.2 3.4 5.1 Calculate (a) the range; 1 n (b) the variance using the formula of form s²= = n-1 Σ (* -*) 2. i=1 (a) R= (Type an integer or a decimal. Do not round.)

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