The length of time needed to complete a certain test is approximately normally distributed with mean 55 minutes and standard deviation 6 minutes. Show your work. a) How much time is enough to finish the test for 90% of all test takers?

b) When a student needs more the 70 minutes, special arrangements need to be made for a student to finish the test outside of normal class hours. What proportion of students are expected to need special arrangement?

What is the difference between regular convex and concave polygons

Put the equation in slope intercept form by solving for y

Bella want to know what the students at her school think of her show. which is the best group to survey to find this information a. go to the mall and ask all of the students she recognizes from school b. ask her viewers to call in durning an episode of the show c. get a list of students at her school from the office and use a random number generator to pick 30 of them d. get a list of students at her school from the office and pick the first 30 students on the list