What are the z-values such that 70% of the area lies in the middle of the standard normal curve?
z = - (?) and z = + (?)

Sherrie is baking a pie for her family. she leaves the room and comes back to 35% of the pie having been eaten before she can put the topping on. how much 1 square inch strips of dough will she need for the top, now that a portion is missing? round your answer to the nearest while nimber.