If you wish to estimate a population mean with a sampling distribution error SEequals0.24 using a 95% confidence interval and you know from prior sampling that sigma squared is approximately equal to 6.4, how many observations would have to be included in your sample? The number of observations that would have to be included in your sample is ? (Round up to the nearest observation.)

Four airplanes carrying a total of 400 passengersarrive at the detroit airport. the airplanes carry, respectively,50, 80, 110, and 160 passengers. a) one of the 400 passengers is selected uniformly at random. let x denote the number of passengers that were on theairplane carrying the randomly selected passenger. find var(x)for x as given in the problemb) one of the 4 airplane drivers is also selected uniformly atrandom. let y denote the number of passengers on the chosen driver’s airplane. find var(y) for y as given in the problem

Afarmer sells 9.5 kilograms of apples and pears at the farmer's market. 4/5 of the weight is the apples and the rest is the pears. how many kilograms of pears did she sell at the farmers market

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.