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Mathematics, 31.07.2019 22:10 130005401
According to the u. s. energy administration, the mean monthly household electric bill in the united states is $99.70 with a standard deviation of $20. given that household electric bills follow a normal distribution, what is the probability that a randomly chosen household electric bill:
a) is over $131.50? b) is less than $80? c) is between $85.50 and $111.50? d) is either higher than $105 or less than $90?
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