GUIDED SOLUTIONS OF IB MATHS | MAY JUNE 2022| AA SL PAPER 2 TZ2 | ALL QUESTIONS | With Timestamps

Timestamps
00:00 Question 1 Circle based
04:45 Question 2 Integration
07:00 Question 3 Arithmetic and Geometric sequesnce
15:08 Question 4 Probability
17:24 Question 5 Box and whisker diagram
25:15 Question 6 Velocity and acceleration
37:35 Question 7 Cosine and sine rule
52:15 Question 8 Rate of change
1:13:30 Question 9 Normal and binomial distribution

[jaketan]

Good video for understanding of major exam questions. For young learners, I suggest a study flow as follows:
1) Attempt questions before viewing this video.
2) Attempt questions again after viewing this video - selected wrong ones in 1) will do.
3) Attempt the same questions again.
*Because understanding obtained in this video is not enough and practices to gain confidence and speed with accuracy is required during exams. Writing out complete answers to a recent pass year paper has these benefits:
1) Gain confidence - at least that you are going to pass this year's exam.
2) Identify learning gaps - topical areas that you need intensive study, e.g. probability and sequences.
3) About 50% of the topics are covered by going through the recent past year paper. And the only sure way to excel is to self-study, topically - each student has individually different learning gaps.😏

[bobthekelpie]

I've got a shortcut for Q7 (d)...

Since we know the full area (9140 m), and the split areas have to be equal, it means each area is 4570 m.

We can work out the length of DA using the area formula for triangle DBA (DA = 56.48) and then use the cosine rule to work out BD... I got 196 m (3 sf) but there may be a rounding error there somewhere.

This approach avoids the angle sum formula which isn't in SL, too.

[bobthekelpie]

THANK YOU! Between this and the Paper 1 video, you have saved me quite a bit of time when marking my students' mock exams. Most of our solutions agree (which is a relief) and there were some questions where I got it wrong and your video showed me where I went wrong. Gold! Hope my comments/corrections pay this back a little!! Many thanks.

[davidsafro]

half the questions are solved wrong, the other half are solved inefficiently, save yourself 2 hours and go watch some better videos

[bobthekelpie]

Thanks for these solutions. Saved me from making a few mistakes on my own solutions! However, I think there's an error with Q3:

(a)
You set up t=0 --> t = 10 at the start (so did I), but that makes it act like a function, i.e. S = 45000x(1.02)^t... therefore for 2021, you have 45000x1.02^10 which gives $54855. I think that's right, anyway!! (Should be the nearest dollar, too)

(b)
Would this not be a linear regression problem? I input the values as a table into my graphics display calculator and got a linear regression line (y=1096.89x + 45094.30)... substituted x=10 for 2021 and got $56063. I'm not sure, but I feel like that's the right approach.

[sergiolopes]

You made a mistake when solving question 4. Sorry to point it out.
When two events are independent, P(A and B) = P(A) x P(B).
You wrote P(A or B) = P(A) x P(B), which is incorrect.
The answer to this question is 1/5 or 0.2.

[bobthekelpie]

Q8 (d) - just checking to see if I have understood correctly.

It says in the question, "find the total amount of time"

So my approach was to use by graphics display calculator to find the intervals (the same three that you found), work out the time interval for the first one (1.05) and then multiply it by three to get 5.85 weeks.

Is that a reasonable approach??

[soilakwatsa]

Thanks. Will you cover past papers as well or perhaps each topic of the IB Math course?👌