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Mathematics: Post your doubts here!

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I'm using the right method as shown in the markscheme and I get the equations right, but somehow I can't get the correct answer. Why? I get the tensions as 6.43 and 4.82
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Hi, do you by any chance have topical past questions for Mechanics 2 [Paper 5].
Can't seem to find some anywhere.
 
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How to solve the simultaneous equation and get the answer?
i get 0.6736 for r but marking scheme says 0.6 for r
 
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Oct/Nov 2009 S1 P62 Q1 How to do this ??
View attachment 61439
I guess first part is not your problem, right? Though, mean = middle value in box - and - whisker diagram. Thus mid value is 51!
for part ii)
We know upper quartile means 0.75 probablity and lower quartile means 0.45 probablity as 0.45 is notgiven in the table thus consider 0.75 probablity and therfore z = 0.674,
CALCULATION :
upper quartile = 63
mean = 51
z = 0.674


0.674 = 63 - 51 / sd
sd = 17.80

do check my answers, m not sure as did S1 a year back :p
 
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I guess first part is not your problem, right? Though, mean = middle value in box - and - whisker diagram. Thus mid value is 51!
for part ii)
We know upper quartile means 0.75 probablity and lower quartile means 0.45 probablity as 0.45 is notgiven in the table thus consider 0.75 probablity and therfore z = 0.674,
CALCULATION :
upper quartile = 63
mean = 51
z = 0.674


0.674 = 63 - 51 / sd
sd = 17.80

do check my answers, m not sure as did S1 a year back :p
aha yeah part ii) your answer is the ms answer so its correct .thanks a lot!
btw why is lower quartile 0.45 ? it should be 0.25 ryt?
 
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