MAT123 Spring 2025 Notes

Fri, 1/31, Do NOT begin TEST 1, on Chapters 1, 2.1 - 2.4 (10%),
until you have examined the content of the page below the Comments Message!

Test 1
TEST 1 Random Number Generator:
TEST 1 Random Number Generator:

Comments ...

Hi,: Usually on Thursday afternoon or night I post a new Friday assignment/text/quiz. Your Test 1 is link above in red .; The notes listed below this message might be helpful and the random number generator is necessary for the test.; Tests grades are posted in Canvas as a percent but computed at the end of the semester as outlined on the grading and cheating page. Friday's test is worth 10% of the course grade.; The test is a pdf. Please print it and put your answers on the test, then scanned or saved as a file named ###.first.last.T1 and .gif or .pdf or some other extension then mailed to yellow@mathnstuff.com or green@mathnstuff.com as attachments.; This time your work must be submitted by SATURDAY night at 11:59 pm.; This is a reminder that this is an OPEN BOOK test and you are encouraged to use your notes or class notes or your textbook or a web resource BUT NOT ANOTHER PERSON. Cheat sheets and free software are listed at the far right.; By now you should have done the odd exercises in the textbook and checked answers listed in the back of the book.; For next Friday's work you will need both a working Excel for spreadsheet work and a working TI calculator.; Go with confidence. Stay safe, A²

Discrete Vs. Continuous

DISCRETE
- only certain numbers are used over the desired interval. You might have data that are integers: numbers like -3, 0, -10, 4, 6, 10, 11, or natural (counting) numbers: numbers like 1, 2, 3, 4, ...

Press the button to generate an example.
· the length of fish, measured to the nearest half inch (whole numbers and halves only)
· a number of things, as in how many nickels there are in a jar (whole numbers)
· a shoe size, as in 8, 8 1/2, 9, 9 1/2
· a grade in school, as in: 1st, 2nd, 3rd
· a night's win (+) or loss (-) in dollar bets (integers)

CONTINUOUS
- all numbers are used over the desired interval. You might have data that are real numbers on a range 0 < x < 6: numbers like 4.387, .58, 5.55555... or you might have real numbers from -3 to 5.

Press the button to generate an example.
· the length of a fish, measured in meters with a meter stick or tape (real numbers)
· a length of time, as in how many months till a birthday
· a height,
· a weight
· the temperatures on Wednesday mornings in January