statistics
posted by david .
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 kilowatthours 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 kilowatthours and a standard deviation of 320 kilowatthours
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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