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secondary 2 | Maths
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It's probability please help me I need it by tomorrow
Date Posted: 7 years ago
Views: 601
Hi Esmeralda, please check the amendments in the comments section for my answer which should help you get the right answer.
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This question is done under the assumption that the bus has an equal chance at arriving at each minute (i.e bus has equal chance at arriving at 7.30 or 7.31) as it is not stated in the question. First, find the probability the each bus arrive before 7.33am. Assuming both bus arrival timings are independent of each other, where the arrival time of the express bus does not affect the arrival time of the normal bus, the probability that you miss both buses is the product of the probability of the express bus arriving before 7.33am and the normal bus arriving before 7.33am. (Formula: Probability of two independent events occuring=Product of the probabilities of each independent event occuring) Sorry for the complicated language but hope this helps!
Date Posted:
7 years ago
Hey thanks so much for answering
I looked in the back of the book where this question comes from and it says that the answer is 3/20 it doesn't say how they got that answer they just show the answer I'm confused on how you got 3/70 as your answer please I left this assignment till the last minute and I am all stressed out
I looked in the back of the book where this question comes from and it says that the answer is 3/20 it doesn't say how they got that answer they just show the answer I'm confused on how you got 3/70 as your answer please I left this assignment till the last minute and I am all stressed out
Hi Esmeralda,
I apologise for the wrong answer. This was because I used the wrong individual probabilities of missing the express bus. Use 1/2 for the individual probability of missing the express bus and you should get the right answer.
As for how to find the probability of missing each bus, find the total number of possible times you miss the bus and divide it over the number of possible times the bus can come. The formula I used is kinda used in JC H2Math but I really cant find a simpler way to answer this question. Sorry :(
I apologise for the wrong answer. This was because I used the wrong individual probabilities of missing the express bus. Use 1/2 for the individual probability of missing the express bus and you should get the right answer.
As for how to find the probability of missing each bus, find the total number of possible times you miss the bus and divide it over the number of possible times the bus can come. The formula I used is kinda used in JC H2Math but I really cant find a simpler way to answer this question. Sorry :(
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