There are 23 textbooks on the shelf in ms. mcdonald's class. each cover is 13 inches long and 5 inches wide ? what is the combined area of all the textbooks?

Given a normal distribution with µ =50 and σ =4, what is the probability that 5% of the values are less than what x values? between what two x values (symmetrically distributed around the mean) are 95 % of the values? instructions: show all your work as to how you have reached your answer. don’t simply state the results. show graphs where necessary.