princessvaeh2625
princessvaeh2625
26.10.2021 • 
Mathematics

68. Post office A local post office weighs outgoing mail and finds that the weights of first-class letters are approximately Normally distributed with a mean of 0.69 ounce and a standard deviation of 0.16 ounce. a. Estimate the 60th percentile of first-class letter weights. b. First-class letters weighing more than 1 ounce require extra postage. What proportion of first- class letters at this post office require extra postage?

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