A class collected data on the weight of each hardcover textbook in their backpacks. The mean weight of the books was 2.3 pounds with a standard deviation of 0.7 pound. If the textbooks were softcover editions, each would weigh 0.3 pound less. What would be the mean weight and standard deviation of the softcover editions of these same books?

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 33 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30 ∘c on monday, but decreased at a constant rate in the next 33 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.