Question: Excel Question: A) find the time required by the lower 30%? B) find the time required by the upper 20% =NORM.INV(0,8, sample mean, sample standard

Excel Question: A) find the time required by the lower 30%? B) find the time required by the upper 20% =NORM.INV(0,8, sample mean, sample standard deviation) My question is how do I write that down for a if it is lower

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