2018年5月2日 星期三

DSE M1 2018 分析

整體而言, 比2017年正路得多, 唔少翻炒, 應該令cut-off更上一層樓, 鬥小心...

Section A

Q1 Probi (Venn diagram), easy, 穩袋5分

Q2 a) confidence interval, easy, 留意 a i 係 (0.0915+0.3085)/2, 唔係減
b) 要理解題目可能有少少難

Q3 a) normal distribution, easy
b) Geometric distribution, also easy

Q4 Expected value/Variance, easy

Q5 d, in, limit, easy, 留意 part a要做 first derivative test

Q6 Expand e^x & binimial expansion, ok easy

Q7 easy differentiation involving square root sign, need to reject h=4.0625

Q8 d and in switch, part c 計 area, easy too, 要加absolute sign

Section B

Q9 a) normal distribution, easy

b) binomial distribution, easy

c) i) ok difficult
ii) and iii) if c i ok, here no problem

Q10 Poisson distribution
a) easy
b) Very good question, use expected value to judge, not difficult though
c) i) easy too
ii) a little bit complicated calculation, but ok bor

Q11 a) trapezoidal rule, standard question
b) i) integration by substitution, easy
ii) need to be careful

Q12 a) ln graph slope y-intercept, easy
b)i) a little bit clumsy, but ok
ii) Subs. t=0
iii) iv) 完全翻炒2015 Q12... 留意part iv係問dN/dt的變化, need to use d2N/dt2 to judge..


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