The radius of a regular decagon, a 10-sided figure, is 15 units. the length of one side of the polygon measures about 9.3 units. what is the approximate area of the regular decagon rounded to the nearest tenth? 273.6 square units 547.3 square units 663.1 square units 1069.9 square units

Arandom sample of 45 observations results in a sample mean of 68. the population standard deviation is known to be 23 a. compute the margin of error at a 959% confidence interval. b. compute the 95% confidence interval for the population mean c. compute the 90% confidence interval for the population mean. d. compute the 75% confidence interval for the population mean