Our environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 6.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 26 samples is 6.2 ppm with a variance of 0.36. assume the population is normally distributed. a level of significance of 0.05 will be used. make the decision to reject or fail to reject the null hypothesis.

Asmall foreign car gete 42 miles per gallon and user 35 gallons on a trip. gasoline costs $1.05 per gallon. what was the cost of gasoline per mile driver?

What is the shape of the height and weight distribution

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)) =