The monthly starting salaries of students who receive an mba degree have a population standard deviation of $120. what sample size should be selected to obtain a .95 probability of estimating the population mean monthly income within a margin of $20? [sample size]

Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?