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At a retail​ store, the spending amount per transaction follows normal distribution with muequals 51 and...

At a retail​ store, the spending amount per transaction follows normal distribution with muequals 51 and sigmaequals 8​, and given you select a sample of 100​ transaction. There is a 30​% chance that sample ​mean(Upper X overbar​) is above what​ value?

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