Find value of z if true mean amount of gas sold is less

Reference no: EM13113581

A gas station sold a total of 8019 gallons of gas on nine randomly picked days. The amount sold on a day is normally distributed with a population standard deviation of 90 gallons.

Suppose we are testing if the true mean amount of gas sold on a day is less than 900 gallons, at a 5% level of significance, the value of z* would be?

Reference no: EM13113581

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