Mathematics: Post your doubts here!

mania _ manal

mania _ manal

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Tha
Talha Irfan said:
P(X = 0) = 1/10 (given)
remaining integers are 7 from the set and the probability is to be divided equally among them
so the probability of one of the remaining 7 integers = 1 - (1/10) divided by 7 = (9/10) / 7 = 9/70

i) P(X<2) = P(X = - 2) + P(X = - 1) + P(X = 0) + P(X=1)
= 9/70 + 9/70 + 1/10 + 9/70 = 0.486

ii) the probability distribution table looks like

x - 2 - 1 0 1 2 3 4 5
p(X=x) 9/70 9/70 1/10 9/70 9/70 9/70 9/70 9/70

now calculate the variance using the formula
E(X^2) - ((E(X))^2

iii) we are going from the negative of a positive number to its twice. so let's check the possibility of a number existing in negative which is - 2 or - 1
so now first possibility
let a be 1 so probabilities should be added from - 1 to 2(1) = 2

P(X=-1) + P(X=0) + P(X=1) + P(X=2)
= 9/70 + 1/10 + 9/70 + 9/70 = 17/35 (shown)[
Click to expand...
 
mania _ manal

mania _ manal

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T
Talha Irfan said:
P(X = 0) = 1/10 (given)
remaining integers are 7 from the set and the probability is to be divided equally among them
so the probability of one of the remaining 7 integers = 1 - (1/10) divided by 7 = (9/10) / 7 = 9/70

i) P(X<2) = P(X = - 2) + P(X = - 1) + P(X = 0) + P(X=1)
= 9/70 + 9/70 + 1/10 + 9/70 = 0.486

ii) the probability distribution table looks like

x - 2 - 1 0 1 2 3 4 5
p(X=x) 9/70 9/70 1/10 9/70 9/70 9/70 9/70 9/70

now calculate the variance using the formula
E(X^2) - ((E(X))^2

iii) we are going from the negative of a positive number to its twice. so let's check the possibility of a number existing in negative which is - 2 or - 1
so now first possibility
let a be 1 so probabilities should be added from - 1 to 2(1) = 2

P(X=-1) + P(X=0) + P(X=1) + P(X=2)
= 9/70 + 1/10 + 9/70 + 9/70 = 17/35 (shown)
Click to expand...
hanks aloot can u help me in ths too http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s12_qp_63.pdf Q2 ii)
 
Supernatral

Supernatral

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PLEASE! I need help, Is there is a list of laws and rules for Pure 1 to memorize so I can solve in exams because I'm screwed?! :cry::cry::cry::cry::cry::cry::cry::cry::cry::cry::cry::cry:
 
M.Fazy

M.Fazy

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Hello everyone , Tomorrow is my Mechanics mocks paper (M1) , and I am quite tensed :oops:
I got everything as a concept rather then the application of Integration !!!!!
I really need help with , why u use integration ?

In this paper " http://adf.ly/i6ULe " go to Question no:6 part iii and tell me what happened there ._________."
I am very confused with that solution , I totally don't understand the point of that question's iii part. Please Answer asap because after 7 Hours from now , It's my paper. :eek:
 
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