# 2017 A-level H2 Mathematics (9740) Paper 2 Suggested Solutions

All solutions here are SUGGESTED. Mr. Teng will hold no liability for any errors. Comments are entirely personal opinions.

Numerical Answers (click the questions for workings/explanation)

Question 1:
Question 2:
Question 3:
Question 4:
Question 5:
Question 6:
Question 7: ; Do not reject , Not necessary.
Question 8: Model (D);
Question 9:
Question 10:

### Relevant materials

MF26

• Jia

Hi. Can you upload question 5 and 9iv/vii. These are the questions that differ from the other paper. Thankyou.

• KS Teng

i dont have that paper. can send me at +65 9815 6827. I’ll do it.

• Jia

Hello. I’ve sent you the papers. Please check π

• KS Teng

thank you

• Kay

Hi! Do you still need the paper?

• rainbow

for 5 i got 0.647, 0.350 and some decimal for the k.
for 9iv i got 0.472 i think x>=19.5 by c.c
for 9vi is conditional prob and i said something about the margin of error being less than the probability of fault 0.08.

• Haizz

Hi, wondering for the hypothesis testing question, is the left tail test accepted? Because in the real world context, the most important thing is u<32? Because if they overstated their claim, they can get sued but if they understated it then it doesnt matter? Well thats my logic but i regretted overthinking and changing my answer during the exam

• rainbow

doubt it. It’s not about the company being sued, it’s about testing if the claim holds true. And since it’s two-tailed the critical region changes also.

• Jan

Will there be βerror carry forwardβ marks?? For eg if part (iii) needs (ii) answers, but my answer for part (ii) was wrong??

• Andrew

Sorry is there any error for 9iii? When i key into GC i get approx 0.47154

• KS Teng

yes, i made a mistake. sorry! Thank you π

• rainbow

dont think the 9iv is correct? from gc value gives 0.472

• KS Teng

yes, my bad. so sorry. typed wrongly. Thank you π

• Jay

Hi, is it okay for you to show the working for 4bi) using the substitution u= a-y^2? Thanks so much for your help! π

• KS Teng

Definitely. So Long as answer is correct π

• Depressed

I’m so sorry. This may seem very pessimistic but I would just like to know, what do u think are the cutoffs for grades C and D? It would be really helpful.

Hello there. This might come off as very pessimistic, but do u by any chance have any idea what the marks range is going to be for grades C and D overall? Would be really helpful

• KS Teng

i reckon is +8 to the normal grade boundaries. π