Question: A study from a local municipality reports that the amount of energy usage per household is normally distributed, with a mean of 185 gig joules

A study from a local municipality reports that the amount of energy usage per household is normally distributed, with a mean of 185 gig joules and a standard deviation of 15 giga joules. If 2 houses are selected randomly and independently from the population, what is the probability both houses have an energy usage of less than 173 giga joules?

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