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Closing prices for a commodity were 21.4 on Monday, 22.2 on Tuesday, 21.8 on Wednesday, 22.4 on Thursday, and 23.2 on Friday. The five-day standard deviation is 0.7 and the 30-day standard deviation is 1.0. On Friday, five-day Bollinger bands using two standard deviations are closest to: A. 24.6 and 21.8. B. 24.2 and 20.2. C. 23.6 and 20.8. |