In 2014, Sally used 5400 units of electricity. In 2015, the price of electricity increased by 8% but Sally reduced her usage to 4500 units.

Sally paid £680.40 for the units she used in 2015.

Did she pay more or less for the units she used in 2014? Show your working.

Please answer!!

Asoccer ball manufacturer wants to estimate the mean circumference of soccer balls within 0.1 in

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?

Explain how you can use the associative property to evaluate (7x50)x4.