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100hours time spend and Standart deviations of 15 hours An architectural engineering firm is analyzing the weight capacity of support beams. The weight capacity is

100hours time spend and Standart deviations of 15 hours

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An architectural engineering firm is analyzing the weight capacity of support beams. The weight capacity is known to be normally distributed with a mean of 250 tons and a standard deviation of 20 tons. What is the probability that the average weight of four support beams will be more than 260 tons? Include all decimals

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