Maths, Addmaths and Statistics: Post your doubts here!

[Bilal Khan]

right, i see some questions, thanks!

need any maths help???

 

[zainabkhann]

need any maths help???

Not at the moment, will let ya know

 

[hellcat]

STATS HELP
Sampling:
each of the 720 students has a four figure admission number. The girls have consecutive odd admin numbers starting at 2001 and the boys have consecutive even admin numbers starting from 2002 .
The school Head used a calculator to generate some random numbers to select students. The numbers were: 0.143 ,0.673 ,0.772, 0.081, 0.219 & 0.5
One of the six numbers that the school head obtained can't be used to select from the population.
a) state which one of the six numbers cannot be used, and explain why it cannot be used.
b) write down the admission numbers of the five selected students

 

[hellcat]

STATS HELP :
Probability :

A box contains black and white cou ters. The probability of of randomly selecting a black counter is 1/6.
1.Find a) the probability of randomly selecting a white counter,
b) the smallest possible number of white counters in the box.
Emily took 2 counters out of the box and both of them were black.
2. What is the smallest possible number of white counters that could be in the box?

Emily asked each of the teachers at her school to randomly select one of the counters from the box.
3. If 25 teachers selected a white counter, estimate the number if teachers at Emily's school




Plz....do help...I need an answer urgently
Thanks in advance

 

[hellcat]

Plz anybody?
Who can answer them

 

[zainabkhann]

need any maths help???

question 5b, need to find the determinant of D, how should i because the matrice doesnt have 4 numbers in the bracket. :/

 

[Minato112]

question 5b, need to find the determinant of D, how should i because the matrice doesnt have 4 numbers in the bracket. :/

The bars do not imply determinant but magnitude.

|d| = √( 82 + (-6)2 ) = √100 = 10 units

 

[Bilal Khan]

Plz anybody?
Who can answer them

i can and i took computer studies as a subject.

 

[Bilal Khan]

Not at the moment, will let ya know

ok anytime.

 

[zainabkhann]

The bars do not imply determinant but magnitude.

|d| = √( 82 + (-6)2 ) = √100 = 10 units

Thankyou so much! Please help me with question 8 from the same past paper, for some reason im getting 8 as k, which is giving me the wrong answer.

 

[Bilal Khan]

STATS HELP :
Probability :

A box contains black and white cou ters. The probability of of randomly selecting a black counter is 1/6.
1.Find a) the probability of randomly selecting a white counter,
b) the smallest possible number of white counters in the box.
Emily took 2 counters out of the box and both of them were black.
2. What is the smallest possible number of white counters that could be in the box?

Emily asked each of the teachers at her school to randomly select one of the counters from the box.
3. If 25 teachers selected a white counter, estimate the number if teachers at Emily's school




Plz....do help...I need an answer urgently
Thanks in advance

sorry yaar,i didnt take stats as a subject.
only maths and add.maths.

 

[Minato112]

Thankyou so much! Please help me with question 8 from the same past paper, for some reason im getting 8 as k, which is giving me the wrong answer.

y is proportional to x^2

y= kx2
2 = k (4)^2
k = 2/16 = 1/8

y = (1/8) x^2
y = (1/8) ((10)^2)
= 12.5

Well i made that mentally, tell me if the answer is right...

 

[zainabkhann]

y is proportional to x^2

y= kx2
2 = k (4)^2
k = 2/16 = 1/8

y = (1/8) x^2
y = (1/8) ((10)^2)
= 12.5

Well i made that mentally, tell me if the answer is right...

Yes it is, I kept on dividing 16/2 thats why i got 8, and in paper 1 since we dont have a calculator, how would i solve this part y=1/8 x 100 ?

 

[Bilal Khan]

y is proportional to x^2

y= kx2
2 = k (4)^2
k = 2/16 = 1/8

y = (1/8) x^2
y = (1/8) ((10)^2)
= 12.5

Well i made that mentally, tell me if the answer is right...

its right.
k is 1/8 not 8.

 

[zainabkhann]

its right.
k is 1/8 not 8.

i know

 

[Bilal Khan]

Yes it is, I kept on dividing 16/2 thats why i got 8, and in paper 1 since we dont have a calculator, how would i solve this part y=1/8 x 100 ?

simply divide 100 by 8.
100/8=25/2=12.5

 

[Minato112]

Yes it is, I kept on dividing 16/2 thats why i got 8, and in paper 1 since we dont have a calculator, how would i solve this part y=1/8 x 100 ?

Well simplify it...

100/8
= 50/4
=25/2
=12.5

 

[zainabkhann]

simply divide 100 by 8.
100/8=25/2=12.5

Oh alright thanks , can you help me in question 6 and 10.

 

[zainabkhann]

Well simplify it...

100/8
= 50/4
=25/2
=12.5

thankyou so much can you send me a good link for someone who is a beginner in sets and venn diagram topic.

 

[Bilal Khan]

Oh alright thanks , can you help me in question 6 and 10.

question 6 and 10 whole questions??