Ungrouped vs Grouped Data

So today Max taught us about the wonderfulness data groups.

Grouped Data- frequency --- table
Boundaries Class Marks frequencies


so i am not exactly sure what it all means but i do know how to do it on the calculator so thats a good thing!!

Just do it the same way ( on the calculator) but you have two tables and then put L1,L2 and the handy dandy tool does it all for ya..

To clear the lists just press 2nd + 4

Population Standard Deviation

Measure of variability within a data set
*** Range is also a measure of variability****

population standard divination measures how varied the data set is relative to itself...
So i not exactly sure what it all means but i do know how to find it on the calculator and right now that's all that matters !! ha

Variability+Statistical Anaysis

Stats

Median- Middle of #, when ascending or descending. N=12, than median is the mean of the 9th divided 10th values.
Mean- x bar, the sum of all the x values, divided by n capital sigma
Mode-Most frequently occurring ( mode may not exist or data may have multiple modes)

Probability!!!

So i thought it was about time to write something about what we have been learning for the last month or so.. (We had our test on it last week Thursday).
Probability = sample spaces/complementary events/ independent/ dependent events..

5/8 .625 62.5% 5 chances out of 8

Independent/Dependent Events
It helped to think RESET button or DON'T RESET..
Factorial Notation
-permutation- ordering in which order matters
-combination-ordering doesn't matter
Mutually Exclusive and Inclusive Events
- Exclusive evnets have nothing in common.. p(a) + p(b)
-Inclusive events have things in common... p(a) + p(b)-p(a and b)

Driveway Question.

Today we had a homework check on that driveway on the question that we have been working on for the last few classes. The main idea for the question was to change the feet into cubic yards and so on. There are two methods one using gravel and concrete and the second one using curshed limestone , sand , paving stone. We had to find the cost of each materials. 1 cubic yard =27 cubic feet.

Friday Morning Pop Quiz

Just want i wanted on a firday morning a personal finance quiz. But thankfully it was not worth marks!! It was more of in class questions .. Oh how teachers can put pure horror into their poor innocent students by just say two words "POP QUIZ"!!
But i hate to admit it actually helped. I think it work us all up.. Mr. Max must have google how to scar your grade 12 students into doing personal finance questions..

Templates

Today we ran through templates:Excel Spreadsheets. So there are 3 things that go hand in hand with that they are:

1. Net Work:Statment(spreedsheet)
2. Debt Equity Ratio (Calculation)
3. G.D.S.R.=Gross Debt Service Ratio(Calculation)

Measures of Financial "Heath"

Network=total asset(own) - Total liabilities(owe)
***Net worth can be negative, and is dynamic, throughout ones life***

Debt Equity Ratio= DxE =(total liabilities-mortgage) divided by network x 100
***Most desirable DxE ratio is 0%****

G.D.S.R=(monthly rent/mortgage+ monthly taxes+ monthly heat) divided by gross household monthly salary x 100
Then we went through a question with the class. This stuff is really good to know for when going into the world and when i have to deal all this good stuff. .