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uJ Page7of9 V H _ u_- v - Hume... Part D: Application (16 marks) 20. Find the mean and standard deviation of the

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uJ Page7of9 V " " H _ u_- v - Hume... Part D: Application (16 marks) 20. Find the mean and standard deviation of the following data. (6 marks) Class Interval Frequency 17 3 8-14 2 1521 4 22-28 1 21. Maple tree diameters in a forest area a normally distributed with a mean of 10 inches and a standard deviation of 3 inches. In a forest of 1000 maple trees, how many would have a diameter greater than 13 inches. Hint: think of the properties of a normal graph

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