Suppose the average score on the GRE is 1000. A group of undergraduates from USD score 1150, 1220, 1028, & 850 on the test. As a group did the USD students perform better than the national average at
the .01 level? What was the value of the test statistic (t score) used to make this decision?

Which of those sequences is a geometric sequence

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?

Perry observes the opposite parallel walls of a room in how many lines do the plains containing the walls intersect