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Mathematics: Post your doubts here!

Esme

Esme

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applepie1996 said:
ummmm yeah you put in x as 2 and you get 1.893018......
now you put this value in your equation again and you get 1.867190575
keeping putting the values you get back into the equation till you get a constant answer continuously in this we keep getting 1.85855 which rounds up to 1.86 :)
Click to expand...

Oh yes 1.86 is the answer we get for iii)
Okay so that's how we do this one... :unsure:
 
applepie1996

applepie1996

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sma786

sma786

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Ashique said:
daredevil
They told us that 225 out of the 900 cartons has more than 1002 milliliters. So what is the probability that a carton has more than 1002 milliliters? It's 225/900= 0.25. So if we were to standardize 1002 milliliters, you'd get a z value that would correspond to a probability of 0,25 in the normal distribution table. But you don't have 0.25 in the table, so you (1-0.25 = 0.75). So the probability that you would be looking for in the table is 0.75. Which is 0.674. Since the probability is GREATER than 1002, the sign won't change in this case.
Click to expand...
Got it, its new, i never used this formula, its annoying how new crap comes out in every new paper :cry:
 
applepie1996

applepie1996

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mominzahid said:
Hi.... can someone please explain q7(ii) and q10(b(ii))
Help would be much appreciated. Thanks.
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w12_qp_33.pdf
Click to expand...
7 part 2
the curves on the i will be taking them as triangles
okay so as given in the question area of one triangle is A with upper limit pi/4
the area of two triangles is 2A with upper limit as pi/4 + pi/4
so then the area of 40 triangles which is 40A with upper limit as 40 x pi/4 so its 10 pi so k=10
 
X

xhizors

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The ages, x years, of 150 cars are summarised by Σx = 645 and Σ x^2= 8287.5. Find Σ(x − x~)^2, where
x~ denotes the mean of x.

ANY one plz
 
P

PhyZac

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xhizors said:
The ages, x years, of 150 cars are summarised by Σx = 645 and Σ x^2= 8287.5. Find Σ(x − x~)^2, where
x~ denotes the mean of x.

ANY one plz
Click to expand...
I just wanted to make sure the answer is correct.

So
they want
Σ(x − x~)^2
so for me this was very hard, since we dont have individual numbers, so i went to the formula book and found the first equation helpful.
If you check it ( i cant write it down) you will see the numerator is similar to the wanted question, so basically I made it the subject of formula, and i got
Σx^2 - n(x~)^2 as the formula

Now it is easy
we have Σx^2 value
and n = 150
and mean is Σx/n
 
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