My cupcake recipe makes 12 cupcakes and requires 1\12(fraction) sticks of butter. i can only buy whole sticks of butter. how many whole sticks of butter must i buy to make 100 cupcakes?

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.

Arectangle has a length of 6cm by 8cm what is the length of a diagonal of the rectangle

Arandom sample of 15 observations is used to estimate the population mean. the sample mean and the standard deviation are calculated as 172 and 63, respectively. assume that the population is normally distributed. a. with 99 confidence, what is the margin of error for the estimation of the population mean? b. construct the 99% confidence interval for the population mean. c. construct the 95% confidence interval for the population mean. d. construct the 83% confidence interval for the population mean. hint: you need to use excel function =t.inv.2t to find the value of t for the interval calculation.