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with explanation The mean income for a group of sample observations is $500 and the standard deviation is $40. The data distribution is approximately normally

with explanation The mean income for a group of sample observations is $500 and the standard deviation is $40. The data distribution is approximately normally distributed. 68%, 95% and 99.7 % of the data values fall within each of the intervals below. Match each percentage with these intervals a) $420 to $580 b) $380 to $620 c) $460 to $540

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