A telephone manufacturer finds that the life spans of its telephones are normally distributed, with a...
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A telephone manufacturer finds that the life spans of its telephones are normally distributed, with a mean of 6.5 years and a standard deviation of 0.5 year. (For each answer, enter a number. Round your answers to three decimal places.) (a) What percent of its telephones will last at least 7.25 years? % (b) What percent of its telephones will last between 5.8 years and 6.8 years? % (c) What percent of its telephones will last less than 6.9 years? % A telephone manufacturer finds that the life spans of its telephones are normally distributed, with a mean of 6.5 years and a standard deviation of 0.5 year. (For each answer, enter a number. Round your answers to three decimal places.) (a) What percent of its telephones will last at least 7.25 years? % (b) What percent of its telephones will last between 5.8 years and 6.8 years? % (c) What percent of its telephones will last less than 6.9 years? %
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a Let X be the life span of a telephone Then X N65 052 We want to find PX 725 Using ... View the full answer
Related Book For
Income Tax Fundamentals 2013
ISBN: 9781285586618
31st Edition
Authors: Gerald E. Whittenburg, Martha Altus Buller, Steven L Gill
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