Im not sure but this is what I did:
a) Mean of y = 1.4(Mean of x)-20 then rearrange for mean of x, it gave like 50 something...
b) The S.d is only affected by the Multiplication so its (S.d of y)/1.4, which gave like 5.somthing....

Reply 64

Moshesimon4ever

for the histogram q I got width 0.5 height 7.5
did any1 else ???

Reply 65

funkypig1234

Original post by Moshesimon4ever

for the histogram q I got width 0.5 height 7.5
did any1 else ???

yes

Reply 66

danimorais

Original post by Moshesimon4ever

for the histogram q I got width 0.5 height 7.5
did any1 else ???

Yeah i got that

Reply 67

Billster96

Original post by Moshesimon4ever

for the histogram q I got width 0.5 height 7.5
did any1 else ???

yes

Reply 68

zweephi

Original post by Billster96

Im not sure but this is what I did:
a) Mean of y = 1.4(Mean of x)-20 then rearrange for mean of x, it gave like 50 something...
b) The S.d is only affected by the Multiplication so its (S.d of y)/1.4, which gave like 5.somthing....

OMG OMG OMG :frown:

( when i first saw that question I was like "wth is this ?" I have never seen it before in any past papers o.o I left it until I finished the 8th question and came back. Try to think as simple as I can and left the room feeling like poop . Well >.< awesome I didn't lose 4 marks

^

yes

Reply 69

danimorais

I got 57.7 for mean and 4.71 for standard deviation I think (?)

Reply 70

Billster96

Original post by zweephi

OMG OMG OMG :frown:

( when i first saw that question I was like "wth is this ?" I have never seen it before in any past papers o.o I left it until I finished the 8th question and came back. Try to think as simple as I can and left the room feeling like poop . Well >.< awesome I didn't lose 4 marks

^

yes

Yea when I first saw it I wasn't certain so I left it till the end, after some thinking I managed to deduce a sensible answer....

Reply 71

GeorgeFrainza

7

How did you work out the height of the histogram?!?!?!?!?!?

Reply 72

funkypig1234

how do you do the intersect question

Reply 73

Billster96

Original post by GeorgeFrainza

How did you work out the height of the histogram?!?!?!?!?!?

I hate these question but after a long time of hating them I learnt how to do them:
Basically:
1.5/(50-20)=x/(80-70), where x is the width you want
Rearrange for x you should get 0.5

For the height:
10/(1.5*1)=25/(0.5*h), where h is the height you want
If you rearrange you should get like 7.5 for the height
(sorry if the values I used are off but I did get 0.5cm & 7.5cm) :smile:

Reply 74

Billster96

Original post by funkypig1234

how do you do the intersect question

Which question do you mean? :s-smilie:

Reply 75

Lord Wells

5

Grade Bounderies anyone?

Reply 76

Cashmee

10

Original post by Lord Wells

Grade Bounderies anyone?

That was an standed paper. So I say 60 for a A.

Reply 77

funkypig1234

Original post by Billster96

Which question do you mean? :s-smilie:

the very last one where it told you to find A intersect B

(edited 9 years ago)

OP

Original post by danimorais

I got 57.7 for mean and 4.71 for standard deviation I think (?)

Correct.

SD is affected by multiplication and division only.

6.6 = 1.4x

x=6.6/1.4

x=4.71

Mean is affected by both multiplication and division.. AND addition and subtraction.

[value-(forgot what the original mean was)] = 1.4x-20

[value]+20 = 1.4x

[value]+20 / 1.4 = x

x = 57.7...

S1 - 10th June 2014

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