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December 22, 2014

Homework Help: statistics

Posted by david on Sunday, June 23, 2013 at 9:51pm.

6. According to the records of Enersource, an electric company serving the Mississauga area, the mean electricity consumption for all households during winter 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
a) Find the probability that the monthly electricity consumption during winter by a randomly selected household from this area is less than 1950 kilowatt hours.
b) What percentage of the households in this area has a monthly electricity consumption of 900 to 1300 kilowatt- hours?

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