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7 The following table gives the distribution of weekly wages in dollars of workers in a certain factory: : Wages Frequency [300, 350) 4 [350,

7 The following table gives the distribution of weekly wages in dollars of workers in a certain factory: : Wages Frequency [300, 350) 4 [350, 400) 8 [400, 450) 12 [450, 500) 12 [500, 550) 4 What is the approximate standard deviation of the weekly wages? a. $62.50 b. $7525000.00 c. $57.51 d. $3307.69

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