In a city, 25% of the people are poor, 60% are middle class, and 15% are rich. What is the probability of randomly choosing a rich or poor person from this city?

Solve with work both bert and ernie received an increase in their weekly salaries. bert's salary increased from $520 to $520. ernie's salary went from $580 to $645. find the percent of increase for each salary. what was the larger of the two percents ?

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?

X-10/4 when x = –18 a 7 b –2 c –7 d 2