H2 Physics and Math Discussion
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H2 Physics and Math Discussion
by violin_lover » Mon Mar 19, 2012 10:19 am
Hi guys, feel free to post any question on Physics and Math here. I'll try my best to help you answer the questions. Many students were caught off guard by the Mathematical Induction problem in the 'A' level exam last year. I hope it wil not happan again. P.S. I am not a full time tutor, just an engineer who is using stochastic process in my daily work and love to solve Math/Physics questions (I am more into Math than Physics)

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Re: H2 Physics and Math Discussion
by babyluvv » Tue Mar 20, 2012 3:13 pm
Post removed
Last edited by babyluvv on Sun May 20, 2012 11:19 pm, edited 1 time in total.

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Re: H2 Physics and Math Discussion
by violin_lover » Tue Mar 20, 2012 3:44 pm
i) probability that no camera is defective = (10.05)^20 = 0.3585
ii) probability that at most 2 cameras are defective = P(X=0)+P(X=1)+P(X=2) = 0.3585 + 20(0.05)(0.95)^19 + 20C2(0.05)^2(0.95)^18 = 0.3585 + 0.3774 + 0.1887 = 0.9246
iii) mean is 20*0.05 = 1; standard deviation is sqrt(np(1p) )= 0.975
i) probability that exactly 12 cups of coffee were sold in 2 hours.
Average in 2 hours is 20 cups. Hence, P(X=12) = 0.01763
ii) probability that in an hour more than 3 cups of coffee are sold.
= 1 P(Y=0)  P(Y=1)  P(Y=2)  P(Y=3) = 0.01034
Feel free to PM me if you need any assistance :)
ii) probability that at most 2 cameras are defective = P(X=0)+P(X=1)+P(X=2) = 0.3585 + 20(0.05)(0.95)^19 + 20C2(0.05)^2(0.95)^18 = 0.3585 + 0.3774 + 0.1887 = 0.9246
iii) mean is 20*0.05 = 1; standard deviation is sqrt(np(1p) )= 0.975
i) probability that exactly 12 cups of coffee were sold in 2 hours.
Average in 2 hours is 20 cups. Hence, P(X=12) = 0.01763
ii) probability that in an hour more than 3 cups of coffee are sold.
= 1 P(Y=0)  P(Y=1)  P(Y=2)  P(Y=3) = 0.01034
Feel free to PM me if you need any assistance :)

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Re: H2 Physics and Math Discussion
by violin_lover » Tue Mar 20, 2012 3:50 pm
I welcome H3 Math too :D

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Re: H2 Physics and Math Discussion
by violin_lover » Tue Mar 27, 2012 3:42 pm
Received too many email queries. I have decided to remove my info and contact :). If you are a part time/full time tutor, please try to solve your own questions. My aim is to assist students (or parents whose kids are taking H2 Math)
Last edited by violin_lover on Sat Apr 07, 2012 11:04 pm, edited 1 time in total.

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Re: H2 Physics and Math Discussion
by Belleza momma » Fri Apr 06, 2012 1:13 am
Hi,
May I know how did you work out for the above answers? the detailed workings?
Thank you!
May I know how did you work out for the above answers? the detailed workings?
Thank you!

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Re: H2 Physics and Math Discussion
by violin_lover » Fri Apr 06, 2012 1:26 am
Belleza momma wrote:Hi,
May I know how did you work out for the above answers? the detailed workings?
Thank you!
Send me an email or leave your email contact here. It's hard to type symbol on the forum. I will scan it and email you.

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Re: H2 Physics and Math Discussion
by whitecorp » Fri Apr 06, 2012 10:53 am
You could try using latex.

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Re: H2 Physics and Math Discussion
by Chris880817 » Sun May 20, 2012 7:05 pm

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