Maths, Addmaths and Statistics: Post your doubts here!

[Asad.Babur]

can anybody tell me how to calculate lower bound and upper bound..
and what is meant by correct to nearest 10
of cm
or correct to the nearest cm

ITs DAMNNN EASY! You mean' ;limits of accuracy' /?

 

[kirann]

ITs DAMNNN EASY! You mean' ;limits of accuracy' /?

i know im asking a stupid question but what to do i dont know it

 

[Asad.Babur]

i know im asking a stupid question but what to do i dont know it

Suppose There is Value 44.6 rounded to 1 DP

So it is definitly Greator than 44.54 As It has to turn 44.6
and Less than 44.65, As it will turn 44.7 then!

So we have >_ (greator than or Equal to ) 44.55 As Lower Bound

< 44.65 as Upper Bounds! !

 

[Asad.Babur]

Now its a trick when it comes to something like its

4000 Rounded to nearest hundered

Answer :

Lower Bound = >_ 3950 (As if it is lower than that, it would convert to 3900)
Upper Bound = < 4050 (As I should have been 4100 or more than! )

Thanks, hope it help!
Feel free to ask anything!

Asad

 

[Asad.Babur]

Guys I really need help in Question 7 Part B (ii).
Here is the paper:
http://maxpapers.com/wp-content/uploads/2012/11/4024_s13_qp_22.pdf
Marking scheme:
http://maxpapers.com/wp-content/uploads/2012/11/4024_s13_ms_22.pdf

DAMN EASY

CLASS.............................MID POINT........................................FREQUENCY.......................................Mid x Frequency
0<y<20...........................10..........................................................34............................................................340
20<y<40.........................30.........................................................57.............................................................1710
40<y<60.........................50.........................................................85.............................................................4250
60<y<80.........................70.........................................................24..............................................................1680


Total = ..........................................................................................200..........................................................7980


SO mean = Sum of Values/Total Frequency

7980/200 =39.9 Years...........
However, I want you to note in GROUPED DATA, we dont know exact values, so it a esitimate, which is not as accurate as reality


Hope it helps

Asad

 

[Asad.Babur]

i know im asking a stupid question but what to do i dont know it

Nothing is DUMB or Stupid, it is a step to victory!

 

[asadalam]

Nothing is DUMB or Stupid, it is a step to victory!

Yar ap ki inspirational quotes dil ko sakoon pohonchati hain : P

 

[Asad.Babur]

Yar ap ki inspirational quotes dil ko sakoon pohonchati hain : P

Thanks bro!

 

[FLRNAB]

DAMN EASY

CLASS.............................MID POINT........................................FREQUENCY.......................................Mid x Frequency
0<y<20...........................10..........................................................34............................................................340
20<y<40.........................30.........................................................57.............................................................1710
40<y<60.........................50.........................................................85.............................................................4250
60<y<80.........................70.........................................................24..............................................................1680


Total = ..........................................................................................200..........................................................7980


SO mean = Sum of Values/Total Frequency

7980/200 =39.9 Years...........
However, I want you to note in GROUPED DATA, we dont know exact values, so it a esitimate, which is not as accurate as reality


Hope it helps

Asad

Thanks bro, I actually forgot to take midpoint of class. Why do we take midpoint anyway?

 

[Asad.Babur]

Thanks bro, I actually forgot to take midpoint of class. Why do we take midpoint anyway?

You know what! When it is Group! A class, cannot be multiplied or processd directly! So for assistance, we use help of MID POIN!

 

[Asad.Babur]

Thanks bro, I actually forgot to take midpoint of class. Why do we take midpoint anyway?

Anytime
So what else could we take/ we can't take extreme values that's ewhy we choose a mid point.

 

[FLRNAB]

Anytime
So what else could we take/ we can't take extreme values that's ewhy we choose a mid point.

Oh ok. Thanks again.

 

[asadalam]

How to do Q3,a)ii)?

 

[Awesome12]

How to do Q3,a)ii)?

Area of one circle = pir^2
Area of one sector =piR^2 /5

pir^2 = piR^2 /5 - (pir^2)

R^2 = 10r^2

10:1

 

[Asad.Babur]

How to do prime, and algebraic factorization in 991 es plus?

 

[Awesome12]

How to do prime, and algebraic factorization in 991 es plus?

Why do you need a calculator for that? Isn't that simple enough?

 

[Lilly2318]

5(a) why isnt my answer 21 30 when it is suposed to b. plz tell me where am i making a mistake? and point out the right method as well

 

[Asad.Babur]

Why do you need a calculator for that? Isn't that simple enough?

It is, however, I prefer being on safer site (BECAUSE I AM DUMBHEAD in ALGEBRAIC Factorizations

 

[Asad.Babur]

5(a) why isnt my answer 21 30 when it is suposed to b. plz tell me where am i making a mistake? and point out the right method as well

Journey is 4 Hours 43 Mins = 283 Mins

So on that day they flight was no more than 2 hours 13 mins = 133 mins

Thus, on previous day the flight duration was 283-133= 150 Mins = 2 hours 30 mins

Lets minus them from 24 hours clock so it 21 30... IN ASSAAAAAAAAN BASHAAA! it 9 30 PM!

It wassssssssssssssssss soooooooooooooooo simple!

 

[Lilly2318]

Journey is 4 Hours 43 Mins = 283 Mins

So on that day they flight was no more than 2 hours 13 mins = 133 mins

Thus, on previous day the flight duration was 283-133= 150 Mins = 2 hours 30 mins

Lets minus them from 24 hours clock so it 21 30... IN ASSAAAAAAAAN BASHAAA! it 9 30 PM!

It wassssssssssssssssss soooooooooooooooo simple!

hahahhahahha