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Maths, Addmaths and Statistics: Post your doubts here!

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Take the mid-value of each given time and convert hours into minutes.
Add up all the times: 175*5+185*14+195*7+205*4=5650
Divide by total members: 5650/30=188.33
Take to the nearest minute and convert back into hours: 188 minutes or 3 hours and 8 minutes

I have no idea why assumed mean was given there as I haven't studied Stats, I solved it all without it.
 
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Take the mid-value of each given time and convert hours into minutes.
Add up all the times: 175*5+185*14+195*7+205*4=5650
Divide by total members: 5650/30=188.33
Take to the nearest minute and convert back into hours: 188 minutes or 3 hours and 8 minutes

I have no idea why assumed mean was given there as I haven't studied Stats, I solved it all without it.

yup that is the way
but i have asked my friend and he gave me the solution with the assumed mean
cud u explain the answer to question 7 (iv) (b)
dont understand it
 
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yup that is the way
but i have asked my friend and he gave me the solution with the assumed mean
cud u explain the answer to question 7 (iv) (b)
dont understand it
Sorry, but without studying Stats I'm unable to understand the idea of systematic sample.
 
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Take the mid-value of each given time and convert hours into minutes.
Add up all the times: 175*5+185*14+195*7+205*4=5650
Divide by total members: 5650/30=188.33
Take to the nearest minute and convert back into hours: 188 minutes or 3 hours and 8 minutes

I have no idea why assumed mean was given there as I haven't studied Stats, I solved it all without it.
The question says to used assumed mean. If u haven't studied Stats, u shouldn't be answering. It misguides some people.
Actual mean = Assumed mean + Mean of deviations
Mean of deviations=sum of deviations/no. of deviations
Deviation= Midpoint - Assumed Mean
 
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In a systematic sample, u first divide 600 by 6, which gives u 100.
any number from the first 100 is randomly selected i.e. from 000 to 099
every 100th successive number is then selected.
the answer is 08

The question says to used assumed mean. If u haven't studied Stats, u shouldn't be answering. It misguides some people.
Actual mean = Assumed mean + Mean of deviations
Mean of deviations=sum of deviations/no. of deviations
Deviation= Midpoint - Assumed Mean

thankx dude but i got the solutions from a friend and understood it
 
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can anyone help me with question 17 part c , question 18 part c and question 22 of may/june 2011 paper 11
 

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Not entirely relevant to this thread but for all u math lovers...U wud need a thought shower on this one..Can u solve this..Just to provoke u all,i challenge u ;) (By the way ,did it in abt 2 days u know well concentrating on it for abt 2.5 hrs in total,estimation ;) )..Have fun20130302_122433-1.jpg20130302_122433-1.jpg open in new thread if u want to..But solve it entirely by urself..cheers ;)
 
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