Any late night peeps still awake? also so that way I don't get this deleted here's a math question;
300 g of an unknown radioactive substance decays to 112 g after 180 seconds. What is the half-life of this substance?

Question 1 of 10 2 points different groups of 50 graduates of an engineering school were asked the starting annual salary for their first engineering job after graduation, and the sampling variability was low. if the average salary of one of the groups was $65,000, which of these is least likely to be the average salary of another of the groups? o a. $64,000 o b. $65,000 o c. $67,000 o d. $54,000