A level Statistics doubt??Post your doubts here!

[A star]

hey guys please answer asap if i find any answer unbelievable through normal can i do it through binomial ? @anikaraisa @mostafamotani

 

[x-gamer-x]

For a normal distribution, 75% data lies below the upper quartile, 75% lies above the upper quartile and 50% lies in the interquartile range. Use any one of the resulting eqs and ull get the answer
P(X<63)= 0.75
P(X>39)= 0.75
P(39<X<63)= .5

have u got any more like that
i knew 3 (i) 68% lies within mean-Sd and mean+Sd
(ii) 95% lies within mean-2Sd and mean+2Sd
(iii) 99% lies within mean-3Sd and mean+3Sd

 

[A star]

have u got any more like that
i knew 3 (i) 68% lies within mean-Sd and mean+Sd
(ii) 95% lies within mean-2Sd and mean+2Sd
(iii) 99% lies within mean-3Sd and mean+3Sd

first one is wrong its actually 2/3 and through calcularion simple accuracy marks may b lost

 

[x-gamer-x]

first one is wrong its actually 2/3 and through calcularion simple accuracy marks may b lost

but its written in book that 68% lies within one Sd

 

[A star]

but its written in book that 68% lies within one Sd

my book it says 2/3
can you screen shot that page pls?

 

[aleezay]

Im sorry I meant 75% lies above the LOWER quartile

 

[x-gamer-x]

my book it says 2/3
can you screen shot that page pls?

 

[aniketjain]

Hey wht tym do u guys have paper...... ??????

 

[A star]

well lets see i hope they accept both

 

[aleezay]

have u got any more like that
i knew 3 (i) 68% lies within mean-Sd and mean+Sd
(ii) 95% lies within mean-2Sd and mean+2Sd
(iii) 99% lies within mean-3Sd and mean+3Sd

I didn't use any formula, its just an assumption. Thats what we used to do in Olevel Statistics, so yeah.. Thanks for sharing these parameters though!

 

[x-gamer-x]

Hey wht tym do u guys have paper...... ??????

will start at 11:00 (gmt +3:00)

 

[aniketjain]

I didn't use any formula, its just an assumption. Thats what we used to do in Olevel Statistics, so yeah.. Thanks for sharing these parameters though!

Wht tym do u have paprer ???

 

[aleezay]

ahh yes i have to review all formulaes i dont know y stats makes me feel after i found out the answer that y didnt i write it it was sooo easy :/

Just dont worry! This isnt something I knew.. It was just an assumption. Except, I was sure of it cz a similar question came when I appeared for Olevel Statistics

 

[A star]

Just dont worry! This isnt something I knew.. It was just an assumption. Except, I was sure of it cz a similar question came when I appeared for Olevel Statistics

yup you had an advantage i am just glad i sisnt take stats in O

 

[aleezay]

yup you had an advantage i am just glad i sisnt take stats in O

Advantage? You still got to know this beforehand. I first came across such a thing in my final exam

 

[Sonysherpa]

The probability of getting more than 1002mm, P(X>1002), is 225/900 = 1/4
Therefore, P(X < 1002) = 1 - 1/4 = 0.75

From the probability table, z = 0.674 (When probability is 0.75).

Standaridising,
(1002 - µ)/8 = 0.674

After doing the calculations, you'll get µ = 997.

Hope that helped

Thank you so much

 

[suhaib05]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w10_qp_63.pdf

How do you Q6(iii)? Please help ASAP!

 

[Noor Ahmad]

How do we solve question 5b?

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s11_qp_61.pdf

 

[syed1995]

first one is wrong its actually 2/3 and through calcularion simple accuracy marks may b lost

it's 0.68268 to be exact. so yeah 68.3% is more accurate..

-1<z<1 = 1 SD within the mean..

2Phi(1)-1

0.68268 Answer

 

[cross]

Does anyone here have S2? I need help there! Please respond! Thanks.