The principal is collecting data to determine how many graduation tickets will be needed by students at the next graduation. she randomly asks 3 students from mr. winking's class which has 16 students in it. how many different groups of 3 does the principal have to pick from?
group of answer choices

560

3360

4096

2.0923 * 10^{13}

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?