Water Usage Narrative
The mayor of the city of Windsor was informed that household water usage is a normally distributed random variable with a mean of 95 litres and a standard deviation of 16 litres per day.
-Refer to Water Usage Narrative. The mayor advertised on a local TV channel for about 3 weeks his intention to give a tax rebate to the 20% lowest water users. If the advertisement lowered the mean usage of 95 litres to 87 litres, what should the adjusted litres-per-day cut-off be?

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The Answer of Water Usage Narrative
The mayor of the city of Windsor was informed that household water usage is a normally distributed random variable with a mean of 95 litres and a standard deviation of 16 litres per day.
-Refer to Water Usage Narrative. The mayor advertised on a local TV channel for about 3 weeks his intention to give a tax rebate to the 20% lowest water users. If the advertisement lowered the mean usage of 95 litres to 87 litres, what should the adjusted litres-per-day cut-off be?

Water Usage Narrative The Mayor of the City of Windsor Was Informed That