July sales for Melodic Kortholt Ltd average 1 9 500
July sales for Melodic Kortholt, Ltd., average μ1 = $9,500 with σ12 5 $1,250. August sales average μ2 = $7,400 with σ22 = $1,425. September sales average μ3 $8,600 with σ32 = $1,610.
(a) Find the mean and standard deviation of total sales for the third quarter.
(b) What assumptions are you making?
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