Developing Expert Voices

Developing Expert Voices

Question #1
Probability test Part IV problem solving

1) A multiple choice test has five questions with four choices for each question. a student guesses at all the answers without reading any questions.

a)What is the probability that she will get all the answers correct?(2 marks)

b)what is the probability she will get exactly three answers correct?(2 marks)

c)what is the probability she will get at least one answer correct? (2marks)


Question #2
Vectors Pre-test question 5

5) an airplane travels at a speed of 250 km/h in a direction 30 degrees north of west for one hour. it then travels at a speed of 300 km/h for 40 min ina direction of 42 degrees east of north. To return directly to its starting point, in what direction and what distance must the airplane travel? show wall work use the back of pag to answer this question remeber draw BIG DIAGRAM



Time Line

May 22
Consult with group (alvina and katie) about what units are project are on and if we ahve a theme to follow. all aroudn get organized.

May 25
meet up in library assign tow questions to a person and help if needed. decide how the project will be put across to the class. Eg: video, slide etc...

May 27
meet up at library or katies house to help eachother wityh any problems...

June 1
put completes questions of the project together.. of whatever we have.

June 3
Start publishing to computer

June 5
complete all finishing touches and hand it in!

scribe post Friday May 8

Sorry for the late scribe post...


Scribe post May 8/09

Today we opened up the class by seeing a pink smart car with hello kitty on it, it was cute... in a "i would never do way" but cute.

We learned how to see how much of your savings and what interest you will have after a certain amount of months, years so on.

in the case that Mr K had given us the payments where made quarterly so for instance with the example he had given us..i had broke it down on the image below...


The next question we worked on showed us how to not only to find the monthly payment but to also find out the complete interest you received and how much it would be to pay it off..

a monthly payment of $8250 loan with a interest rate of 8.5% compounded monthly...If the loan is repaired in 2 years (24 months)

to determined the monthly payment we go to are tvm solver on our calculator under finance and fill it out like this...

the pmt (payment) amount was -376.52 because you are taking it FROM your money to pay it off.

To determine the total cost of Repaying the loan would be 376.52* 24
---24-- because of the 24 month payment

= 9036.48

You take that amount and subtract the principle value, so the value you started with .

9036.48-8250= $786.48


Sorry again for the late scribe post if anything is wrong with this scribe please comment so i can fix it!
thank you see you Monday!

next scribe is...Alvina!
(if Alvina had done it already then .....Katie!)

reflection #2 (vectors)

This is my reflection on vectors

This unit was one of the shortest ones i have ever done, i understood most of it other then the Parallelogram Method, and when all the questions were put into super complicated problems where words were switched around. That was the only time i was somewhat lost. Other then that i got everything i was so excited and proud, it was taught well and pretty easy understood.

:)


...sorry was late...

Okay so today was our pre-test.

We got into groups and worked together on the questions.

Mmmm the test was alright, I'm glad we got to work with other people because I was honestly stuck on a few questions.

Here's a little review:

Let's say vector a is going 6 cm east of west and turns 90 degrees south. That vector, b, is 10 cm south of north. It's tip-to-tail so we have to use the triangle method. We need to find the resultant, which is the missing vector that connects to vectors a & b, creating a triangle.
Since one of the angles is 90 degrees, we can use the pythagorean theorem. a(squared)+b(squared)=c(squared)
36+100=136
11.66=c

The resultant vector equals 11.66cm.

Don't forget how to use trisolv2 on your graphing calculators. It really helps me.

Well our test is tomorrow..actually very soon..so study and good luck=)
(sorry for the late scribe)


The next scribe can be Lamael(:

REFLECTION!

Well the unit we were on was on vectors. I didn't really understand it at first. We had to review some of our trigonometry knowledge from years before. After the review I started to understand what we were being asked for. Since the program Trisolve2 was introduced to us, I started to understand more about the unit and help me figure out the sides and angle more. I found this unit to be a really short unit.

Reflection

Reflection

The vector unit was not too difficult. The beginning was easy like when we had to find the length using our rulers, then angle using our protractor, and just all 4 notations for writing a vector. Once we got to using the Pythagorean Theorem on vectors it was a little confusing for me at first, but I eventually got it. I like using "trisolve2" i think it is way easier to solving a triangle. I don't like the parallelogram method so much. I know I have to work on that.

Reflection

Reflection

So this is my reflection on the unit of statistics, unfortunately i was away for a week during this unit but when i got back and learned things the same time as the rest of the class i understood.

The things i understood where things like:

• the binomial and normal distribution,
• how you calculate.
• i also understand the mean median and mode good.

the things i didn't understand was:

• the z-scores, how to get them and what they are and do.
• how to get a histogram on your calculator and what it represents
• inversnorm command
• the standard deviation.
• the shadenorm and normalcdf normalpdf are understandable but i am not completely confident in it and that is because i don't know which to use for what problem. usually my problems start because i don't know which formula to use for what problem...

over all this unit was good a little hard but hopefully i pass the test and carry on with my studies.

thanks.

April 07/09 scrib

Hey guys sorry for the late post my relative had gone in to the hospital, so i only got home at 11... Also please bare with me on today's class's scribe because i am not understanding the work very well and am still learning. so anything i have posting that is incorrect please leave a comment so i can correct it which possibly some help

Today we worked with Z-scores and the normal curve

Before we got into it MR.k had given us a Littlee quiz on determining the length of arrowheads one standard deviation below and one above the mean of numbers. Also on knowing what percentage of arrowheads are within one standard deviation of one mean length.

We then corrected the quiz and handed it back

Next we talked about curving marks..



The graph above represents the marks of a large number of students with the mean mark of 69.3% and stranded deviation of 7

so this shows that the students with the marks of 62.3 to 76.3 are the mean marks of the class and are about 68-69 percent are in that mean. as the others shows above.

So knowing this then

68% of the marks are between 62.3-76.3 percent
34 percent are between 69.3 and 76.3 percent
50% are below 69.3%
and 16% are above

So since we have been doing non standerd deviations till this point which means the mean and standard deviation of the distribution or problem have been the standard deviation and mean of the data. now we will try a


standard normal deviation

scale on the x-axis on the window of your calculation is the Z-score(standard score) which is the mean. and standard deviation is 1 so since it is a probability distribution the area under the curve=1
which means it is 100% chance of every score being included in this problem(distribution)

To figure this out on the calculator you press

WINDOW
(then add your y and x numbers along with the xscl etc..)

QUIT

2nd VARS(dist)
(then move to the right to draw)

then press number 1 which is shadenorm

then in the open bracket put in the standard deviation and mean i think

close bracket

ENTER

your graph should be shown..

that's about all we did in class again if anything is in correct please leave a comment and help me correct it because i am unsure of my knowledge of this unit.

I'm trying and hoping to succeed

next scribe is...KATIE