According to the records of an electric company serving the Boston area, the mea

Question

According to the records of an electric company serving the Boston area, the mean electricity consumption during winter for all households is 1650 kilowatt-hours per month. Assume that the monthly electricity consumption during winter by all households in this area have a normal distribution with a mean of 1650 kilowatt-hours and a standard deviation of 320 kilowatt-hours. The company sent a notice to Bill Johnson informing him that about 85% of the households use less electricity per month than he does. What is Bill Johnson’s monthly electricity consumption?

Round your answer to the nearest integer.

Explanation / Answer

mean is 1650 and standard deviation s is 320

for 85% the z value is 1.04 from the normal distribution table

thus answer is mean+s*z=1650+320*1.04=1982.8

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.