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According to the records of an electric company serving the Boston area, the mean electricity consumption...

According to the records of an electric company serving the Boston area, the mean electricity consumption for all households during winter is 1650 kilowatt-hours per month. Assume that the monthly electricity consumptions 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.

Find the probability that the monthly electricity consumption during winter by a randomly selected household from this area is less than 1861 kilowatt-hours.

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