Read: The Wikipedia page on Standard Deviation.

Make:

1. A JavaScript program that determines the number of days in a given month. The input should be a single string, e.g., "2 1900" (for February, 1900). The script should disallow all bad data- e.g., improper months, years prior to 1600, etc.- by repeatedly prompting for input until good data arrives. The output should be a single number. Note: Except for processing the input string (with String.split()), you do not need, nor should you use, arrays or JavaScript Date objects for this problem.

2. A JavaScript program that determines the number of days between two given dates. The script should prompt for two strings like 12 1 2009 and 3 1 2010. If the same date is given twice, the answer is zero; for consecutive days, the answer is one; etc. The script should disallow bad data- e.g., improper months, days that don't occur in the given month, years prior to 1600, etc.- by repeatedly prompting for input until good data arrives. Again, the output should be a single number. Note: Except for processing the input strings (with String.split()), you do not need, nor should you use, arrays or JavaScript Date objects for this problem.

3. A JavaScript program that determines the average of an arbitrary list of numbers. Your script should prompt once, for a single string, which will contain all of the data (numbers, separated by commas, e.g., the input might be a string like 23,-1.23,10,10,3.1416,1000 .

4. A JavaScript program that determines the standard deviation of an arbitrary list of numbers. Again, your script should prompt once, for a single string, which will contain all of the data (numbers, separated by commas.

To submit your programs, "publish" them on your website. In particular, put links on your home page to Days in Month, Days Between Two Dates, Average, and Standard Deviation.