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Edexcel S1 7th June 2017

HOW DO YOU FIND THE NEW MEDIAN? ( 5 marks :'()

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I got 19.75 thi k its wrong though
Original post by techcloud14
I got 19.75 thi k its wrong though


I got that too
Its definitely correct!
what did you guys get for the probability distribution on the last question
I got 19.75 too, I believe you did it like this:

Let X be the new median point

p(T>15)/2 is p(T>X).

You had already worked out p(T>15), so you just halved that, then put in (X-mean)/standard deviation = the new median in terms of z

Then rearranged to get X = 19.75
Original post by bakersgonnabake
HOW DO YOU FIND THE NEW MEDIAN? ( 5 marks :'()


I got 20.25 but a lot of people are getting 19.75 :frown:
Reply 6
Avatar for Bellakn99
Bellakn99
What were the answers for the first question?
i messed up and got pmcc=-0.02 or something like that
Original post by webb-tom2
I got 20.25 but a lot of people are getting 19.75 :frown:


Same I got 20.25
Reply 9
Avatar for Speccyy
Speccyy
2
Original post by bakersgonnabake
HOW DO YOU FIND THE NEW MEDIAN? ( 5 marks :'()


IKR!? Jesus I've never seen that, how do you even interpolate the median or anything for Normal Distribution.....
Also Q1 sorta ****ed me a bit, other than that all seems fine, but was HARD AF!
Original post by S1 was piss
Same I got 20.25


That makes me feel a little better
[QUOTE="techcloud14;71941100"]i messed up and got pmcc=-0.02 or something like that[/QUOTE

I got the same, some people multiplied by 1000squared. Really no idea
Reply 12
Avatar for Speccyy
Speccyy
2
Original post by will_cash
I got 19.75 too, I believe you did it like this:

Let X be the new median point

p(T>15)/2 is p(T>X).

You had already worked out p(T>15), so you just halved that, then put in (X-mean)/standard deviation = the new median in terms of z

Then rearranged to get X = 19.75


OMFG i did that and just left it right before re-arranging because looked redicilous if median was so much above mean, fuuuuuck!?
Reply 13
Avatar for JordnW
JordnW
1
I'm pretty sure it was 20.25
I got 19.75 and 20.25. But i crossed out the 19.75 at the end
I got 19.75 !!!

Posted from TSR Mobile
Also i made a forum for my answers if anyone wants to compare :
http://www.thestudentroom.co.uk/showthread.php?p=71940744

Posted from TSR Mobile
i got the median as 26.5
Original post by will_cash
I got 19.75 too, I believe you did it like this:

Let X be the new median point

p(T>15)/2 is p(T>X).

You had already worked out p(T>15), so you just halved that, then put in (X-mean)/standard deviation = the new median in terms of z

Then rearranged to get X = 19.75


I did it like so,
I took p(X<t)=1 and found her max time, which was 38 mins...
then, since 15 mins was eliminated, i did 38 minus 15, divided this by 2, which equals to 11.5...
finally, i added this to 15, and got 26.5 as the median.
(after all, the median is the middle value)...
hope its right tho:s-smilie:
Probability/0.7 something = 0.5 where 0.7 something was the value for probability its more than 15 minutes.
Then you just work with X-mean/sigma = probablity value from table and solve for X

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