Statistics 1: Post Your Doubts Here

[Amy Bloom]

who is doing 62 tomorrow ?

me

 

[Amy Bloom]

 

[yazan1995]

me

Good Luck!

 

[momo_khan]

Hey there can u help me with these questions please. I shall be very grateful. If u can include some explanations to refresh a bit my memory, would be nice ^^
I've included the expected answer in red.

did you get answer to these ?

 

[Amy Bloom]

did you get answer to these ?

Yeah. someone had pm me the answers, months ago ^^

 

[babycry]

Cool thanks!
I have posted a doubt above. can u help me in dat?

ok draw a tree diagram. for first branch you do 0 and not zero. secod branch p>=4 and p<4. so you get 0.2*0.4 as the required branch which is the probability.
for part 2 you say a=winning the first time which is 0.2. then do a g.p where 2nd term is 0.08,a is 0.2 to give r as 0.2
so p=0.4(0.2^n-1)

 

[Amy Bloom]

ok draw a tree diagram. for first branch you do 0 and not zero. secod branch p>=4 and p<4. so you get 0.2*0.4 as the required branch which is the probability.
for part 2 you say a=winning the first time which is 0.2. then do a g.p where 2nd term is 0.08,a is 0.2 to give r as 0.2
so p=0.4(0.2^n-1)

Sorry i don't get it. Where does that 0.2 come from?

 

[babycry]

add probabilites for 4,5,6

 

[Amy Bloom]

add probabilites for 4,5,6

p(4)+p(5)+p(6) = 0.16+0.16+0.08=0.4 !!!
o.2 comes from where?

 

[babycry]

sorry my bad, i thought u meant p>=4 the 0.2 comes from the prob distribution table,at p=0. u know how to mak it right?

 

[Amy Bloom]

sorry my bad, i thought u meant p>=4 the 0.2 comes from the prob distribution table,at p=0. u know how to mak it right?

Gosh! yeah, how stupid of me (*facepalm*)! Yeah i got it. thanks buddy!

 

[Amy Bloom]

babycry Can I annoy you one last time? See my doubt on top of this page. please. ^^

 

[Khalifa]

babycry Can I annoy you one last time? See my doubt on top of this page. please. ^^

Its because (BBGG) can be arranged in 6 different ways
They are:
GGBB GBBG BBGG BGGB BGBG GBGB
Or 4!/(2!2!)
Or 4C2 ways as out of 4 people u choose 2.

When you get the probability for one combination, multiply by six to get total probability as it can occer 6 different ways. This is because they are mutually exclusive
And insted of adding 6 times, its easier to multiply by 6

Personally its easier to do it by the second method as you skip alot of calculations

 

[InnocentAngel]

Could anyone please help me with this perm and combi question .

 

[babycry]

Its because (BBGG) can be arranged in 6 different ways
They are:
GGBB GBBG BBGG BGGB BGBG GBGB
Or 4!/(2!2!)
Or 4C2 ways as out of 4 people u choose 2.

When you get the probability for one combination, multiply by six to get total probability as it can occer 6 different ways. This is because they are mutually exclusive
And insted of adding 6 times, its easier to multiply by 6

Personally its easier to do it by the second method as you skip alot of calculations

i totally agree with u the 2nd method is better

 

[momo_khan]

Help needed with:
View attachment 17822

can you give the answer to question 5 part 2 ? thanks in advance

 

[athaan]

View attachment 17919 Could anyone please help me with this perm and combi question .

if you only use 6C3, that is not correct since you're asked to take 4 pegs, not 3. 6C3 is to 'pick the colors'.
If 3 colors has been chosen, you need to list all the possibilities of the 4 pegs you obtain with those 3 colors.

4!/2! + 4!/2! + 4!/2! is necessary as it count the total combination you can have with three colors.
But there isn't just three colors, there are six! Therefore, 6C3 is used.

Hope it helps a bit.. I know my explanation isn't that good

 

[deeksha russell]

suppose a vehicle is licensed in a state that issues license plates that consist of 3 digits(between 0 to 9)followed by 3 letters (bet A to Z).If a license number is selected randomly,what is probability that yours is the one selected?

 

[kishan1in]

Q8, Paper 6683/01 Edexcel GCE Statistics S1, A/AS Friday 20 May 2011 Afternoo. I am unable to understand Part G of this question. Why compliment of 5 not 1 etc.? Kindly help.

 

[kishan1in]

Q8, Paper 6683/01 Edexcel GCE Statistics S1, A/AS Friday 20 May 2011 Afternoo. I am unable to understand Part G of this question. Why compliment of 5 not 1 etc.?