1. (Very easy) find the mean of a list
	q findmean.q 2 3 1 45 3
2. (Easy) find the present value of a set of payments, each once per year
assuming an interest rate of 6.5%.
	q presval.q 100 300 200 400
3. (Easy) design a procedure to find the 95% confidence interval of 
the average of a list
	q findconf.q 3 2 1 4555 2
4. (Middle) determine whether the difference between two means
of measurements taken at different days is significant
	q evalsig.q 3.4 4 5 _ 3.2 3 1
 	q evalsig.q 10 -10 6 _ 0 7 0 7 0 7
returns the average of the first list, the average of the second
and the p-value that the difference in the average will be this great.
5. (Middle) The present interest rate is 5%.
	Over each of the next five years (including the first year), 
	the interest rate can go up
	by 0.5%, down by 0.5%, or stay the same, all with the same 
	probability.
	Find the median net 5 year interest rate, as well as the 75th
	and 25th percentiles.

	q montecarlo.q 5 0.5
6. (Middle) Find all the dates of all the weekend days (Saturday/Sunday)
over some year.
	q findweekend.q 2011
