What is 143/8 written in mixed numbers

Which of the following system of equation is not equal to the system of equations is not equal to the system of equations shown below

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

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