SOLUTION: 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
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Question 924195: 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 1900 kilowatt-hours Answer by ewatrrr(24785) (Show Source):
You can put this solution on YOUR website! mean of 1650 kilowatt-hours and a standard deviation of 320 kilowatt-hours.
Note:
P( x < 1900) = 9( z < 250/320) = P( z < .7813) = P(-100, .7813) = .7827
Using a TI or Similarly a Casio fx-115 ES plus
