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# OCR MEI Statistics 1 (S1)

1. (Original post by nicknickmac)
for the probability of the third person using that browser? yep i did too :-)

for the next question about 2nd or 3rd person did anyone do (.92 x .92 x .8) + (.92 x .8)?
Yes I did that
2. (Original post by EmmaJane_)
Left revision far too late and couldn't answer half of the questions.
Facepalm.
Same here 'poker face :/

This was posted from The Student Room's Android App on my GT-I9100
3. (Original post by George_)
Yeah I did that!

And for the mean and SD question I got 1890.625 = mean, 890 something = sd.
I got the same mean as youuu but my sd was like 849.. did you remember to divide by n-1? rather than just n?
4. any ideas on grade boundaries ???
5. did people put for one of the question i think it may have been the broswer one where there were 20... did u guys do 1- (p that none had used the browser) which was 1 - 0.92*20
6. I failed that paper. I really hope its a low grade boundary

This was posted from The Student Room's Android App on my GT-I9100
7. (Original post by sreddy17)
did people put for one of the question i think it may have been the broswer one where there were 20... did u guys do 1- (p that none had used the browser) which was 1 - 0.92*20
doesn't that come out as a negative number? x
8. What did you guys put as the skewness of the line graph? I thought it was negative but I'm not sure. :-/
9. (Original post by nicknickmac)
doesn't that come out as a negative number? x
0.92 to the power 20 doesnt!
10. (Original post by nju)
any ideas on grade boundaries ???
Not sure but the previous ones would suggest that it would be around 55-60 depending on how everyone did.
11. (Original post by fayola1337)
What did you guys put as the skewness of the line graph? I thought it was negative but I'm not sure. :-/
it was definitely negative
12. (Original post by nicknickmac)
I got the same mean as youuu but my sd was like 849.. did you remember to divide by n-1? rather than just n?
Yeah, I probably did get 849. Just can't remember :P Mixing up 1890 and 890 :P

Definitely got 1890.625 though.
13. (Original post by fayola1337)
What did you guys put as the skewness of the line graph? I thought it was negative but I'm not sure. :-/
I put it was negatively skewed but almost symmetrical
14. (Original post by George_)
Yeah, I probably did get 849. Just can't remember :P Mixing up 1890 and 890 :P

Definitely got 1890.625 though.
fab
15. (Original post by sreddy17)
0.92 to the power 20 doesnt!
ohhh to the power of 20, you wrote 0.92*20 haha :') x
16. For the 20 people with the browser question, what did people do?

I did 1 - P(X=0) with X~B(n,p)

to get 1 - 20C0 * 0.08^0 * 0.92^20 which just = 1 - 0.92^20 = 0.8113
17. (Original post by George_)
For the 20 people with the browser question, what did people do?

I did 1 - P(X=0) with X~B(n,p)

to get 1 - 20C0 * 0.08^0 * 0.92^20 which just = 1 - 0.92^20 = 0.8113
ye i did that i just wrote it! haha
18. first question did ppl just do 30/50 x 29/49 x 28/48
19. What did you guys get for the revenue one for the governemt for the cars?
did you do 25/80 x 15000000 or whatever?
the x by 1000?
20. (Original post by George_)
For the 20 people with the browser question, what did people do?

I did 1 - P(X=0) with X~B(n,p)

to get 1 - 20C0 * 0.08^0 * 0.92^20 which just = 1 - 0.92^20 = 0.8113
That's what I got too as far as I remember

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