Find the incorrectly used symbol or symbols in each of the following statements or formulas. For each

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Find the incorrectly used symbol or symbols in each of the following statements or formulas. For each statement or formula, (1) state which symbol(s) is/are used incorrectly, (2) explain why the symbol(s) in the original statement is/are incorrect, and (3) state which symbol(s) should be used. 

a. The mean and standard deviation of the sample of reaction times were calculated (m = 54.2, SD2 = 9.87). 

b. The mean of the sample of high school student GPAs was μ = 3.08. 

c. range = X highest − X lowest

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