Si 18 bolas de acero tienen un peso de 7,200 gramos. ¿Cuánto pesaran 50 bolas iguales a las anteriores?

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?

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers

Arectangle plot measure 20ft. by 30ft. a 3-ft.-wide sidewalk surrounds it. find the area of the sidewalk.