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junior college 2 | H2 Maths
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Clara
Clara

junior college 2 chevron_right H2 Maths chevron_right Singapore

Hi, can someone help me check my ans for qns 6 and lemme know if it is to use poisson, poisson then binomial method to solve? If it is, may i know how will the formula look like for part 2? Cuz im unsure how to write the formula in with a range of X values.

Date Posted: 2 years ago
Views: 325
PhysChemTutor
PhysChemTutor
2 years ago
Please take note that a new r.v. has to be defined for each part.
PhysChemTutor
PhysChemTutor
2 years ago
Hi Clara, Mr J pointed out one error in my solution. Updated and uploaded.

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No need use binomial distribution,
The question is asking for a range of values within a week, and accidents each day event is independent of each other.
So u can add up the 1.45 each day for 7 days.

P(6<_X<_9) can be re written as
P(X<_9)-P(X<_5)
From here, u can use gc to calculate.
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Yao Shian
Yao Shian's answer
13 answers (A Helpful Person)
1st
PhysChemTutor
PhysChemTutor
2 years ago
Sorry, must use a new r.v. with a new mean
Yao Shian
Yao Shian
2 years ago
Yes, I wrote add up 1.45 each day for 7 days worth. So it technically means a new mean.
PhysChemTutor
PhysChemTutor
2 years ago
Right, the r.v. need to use another symbol too. like Y.
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PhysChemTutor
Physchemtutor's answer
1551 answers (A Helpful Person)
PhysChemTutor
PhysChemTutor
2 years ago
Thank you to Mr J having pointed out my mistake again. Some amendment is made and updated. Sorry
Clara
Clara
2 years ago
Thank you for the update! Ive finally managed to solve the qns to get the answers using the formula! Took me quite abit of additional read up to underatand. Tysm! Appreciate it :D
PhysChemTutor
PhysChemTutor
2 years ago
Good. Enjoy helping harder working students