Question: If a variable can be assumed to be normally distributed, with sample mean of 12.34 and best estimate of the standard deviation of 3.44, what

If a variable can be assumed to be normally distributed, with sample mean of 12.34 and best estimate of the standard deviation of 3.44, what percentage of all sample observations can be expected to have values in the range 8.90 to 15.78? 34 95 68 5

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