7.2 a population has a mean of ? = 80 and a standard deviation of ? = 10.
a. if you select a random sample of n = 4 scores from this population, how much error would you expect between the sample mean and the population mean?
b. if you select a random sample of n = 25 scores from this population, how much error would you expect between the sample mean and the population mean?
c. how much error would you expect for a sample of n = 100 scores?

You’re repairing a large rectangular aquarium. the final step is to cover the glass with a protective film. the front and back of the aquarium measure 4 meters by 2 meters, and the sides of the aquarium measure 3 meters by 2 meters. how many square meters of protective film do you need? ( )

Someone answer asap for ! a discount store’s prices are 25% lower than department store prices. the function c(x) = 0.75x can be used to determine the cost c, in dollars, of an item, where x is the department store price, in dollars. if the item has not sold in one month, the discount store takes an additional 20% off the discounted price and an additional $5 off the total purchase. the function d(y) = 0.80y - 5 can be used to find d, the cost, in dollars, of an item that has not been sold for a month, where y is the discount store price, in dollars. create a function d(c(x)) that represents the final price of an item when a costumer buys an item that has been in the discount store for a month. d(c(x)) =

With number 11 ( show how you got the answer)