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# Math OERMath 105 Overview

## Under Construction. Everything Might Change. Trust nothing! Keep your laser handy! The computer is your friend!

Calculators are allowed.
Your own Math 105 notes are allowed.

Looking at the class textbook, class website, or other websites is not allowed.
Working with people is (sadly) not allowed.

Get everything you need organized into your own useful notes!

There is no time limit.
But trust me, one or two long sessions works better than many tiny ones.

After your written work is graded we will meet for a brief oral exam.

Reduce fraction answers. No need to change improper fraction answers to mixed numerals.

Your best 36 problems will count for your grade. Consider doing more than 36 problems to have some "safety net problems" in case your main 36 problems have errors.

#### Finance

Look at the next four word problems. Wait to actually solve the problems. Prepare by writing which formula you will use to solve the problem and explain how you know that formula is indeed the proper one for the situation.

17. For problem 21 the formula to use is ____________and the clues that show that are ____________ .

18. For problem 22 the formula to use is ____________and the clues that show that are ____________ .

19. For problem 23 the formula to use is ____________and the clues that show that are ____________ .

20. For problem 24 the formula to use is ____________and the clues that show that are ____________ .

Be careful with these two-step problems.

#### Displaying Data

Problems that need to be made:

29. Continuing the previous problem, find the range of those numbers.

30. Continuing the previous problem, find the standard deviation of those numbers.

31. Here are two sets of numeric data values: blah and blah. Copy them both, separately, into this histogram maker. Explain how you can look at the histograms to determine which data set has a larger mean, median, range, and standard deviation. Include estimates of those that you got merely from looking without doing any calculations except mental subtraction.

#### Probability

Problems that need to be made:

37. How many 5 digit PINs can I make if I can use numbers 0 through 9 with repetition allowed?

38. There are 10 candidates and we are choosing which 5 will debate on the first night. Order does not matter. How many ways can we pick those 5 debaters?

39. You have 3 types of bread, 4 kinds of cheese, and 2 types of vegetable. How many different sandwiches that include one of each are possible?

40. I have 10 clean shirts in a drawer, and I need to pack 4. Order does not matter. How many different ways could I end up picking 4 shirts to take?