Edexcel S1 - 15th June, 2016 [Exam Discussion]

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0.5cm^2 was the area that represented 1 person.
since the class had 17 people, we can find the area by multiplying 0.5 by 17, which equalled 8.5cm^2
and the width for that question was 0.5cm
therefore, to find height we divide 8.5 by 0.5, which equalled 17

Reply 961

mbh16

i got 40 something people to eat dinner what about everyone else?

Reply 962

Avocado2002

Original post by WashingPowder

1. 9.44 , y= 0.722 + 0.0142x (Not with y and x , but w/e they gave you) , 5.692 ,
2 or 3. 0.15 , 0.175 , 0.65, -0.754?
4. 0.03 (Probability of D but nothing else?), 0.22 (Just Room no dinner/breakfast), 0.45 (The p(D | B overlap R)), 0.405 (p(D | B overlap R' )), 33 (No of Dinners? or w/e it was)
5. 17cm (height) , 3.39 (Median) , 3.43 (mean), 0.68 (Standard Deviation), 0.2546 (The probability).
6. 0.0668 (Probability of W > 240??) , 206.33m (Minimum distance Nathaniel had to run to be in top 20%) , 0.82 , 0.36 (The P ( z < mu - 40 | z< mu)) or w/e it was

Theres my answers, See if you got any the same :biggrin:

How did you work out the number of diners?

Reply 963

Exavior

Original post by mbh16

i got 40 something people to eat dinner what about everyone else?

I dont hink anyone got coherent answers on this one lol

Reply 964

alexesl17

Original post by WashingPowder

i remember the median to be 3.47

Reply 965

mbh16

Original post by kelvin1745

oh nice i got this too

Reply 966

Siddhart1998

Original post by wr123

I'm thinking more along the lines of 58/75 for an A

Last year's was harder tho?

Reply 967

Apolexian

Original post by Avocado2002

How did you work out the number of diners?

expected =probability x number

you times the probabilities you got in the previous ones by the numbers they gave you and add them.

its the same thing as E(x)

Reply 968

Jackhawkins21

The answer for the dinner q was 33!

Reply 969

timelizard

Original post by mbh16

i got 40 something people to eat dinner what about everyone else?

i got 33

Reply 970

mbh16

Original post by alexesl17

i remember the median to be 3.47

i do too

Reply 971

Exavior

Original post by Apolexian

expected =probability x number

you times the probabilities you got in the previous ones by the numbers they gave you and add them.

its the same thing as E(x)

I did this and I got 33 Lol

Reply 972

DirkGroovy

Original post by Avocado2002

What was the WJEC S1 exam like?

Personally i found it pretty difficult but in general the people i have talked to have had a better time but unfortunately as i said earlier hardly anyone does WJEC :s-smilie:

Reply 973

ShatnersBassoon

For question 2, I got Var(X) = 2.115.
For question 6, I got 4 hours 34 minutes (or 274 mins).

Original post by Florent venhari

For question 6.a, i left it as the probability. Will i lose a mark for not multiplying by 100?

Absolutely not. You can never just randomly multiply anything by 100 - you could have multiplied by 100% (which is equal to one) - but the question did not specify to leave your answer as a percentage so any form (decimal, fraction, percentage, heck even a per mille) should be fine.

Reply 974

HasanRaza1

Original post by Siddhart1998

Last year's was harder tho?

true im thinking 60 for an A

Reply 975

mahmzo

Original post by Florent venhari

For question 6.a, i left it as the probability. Will i lose a mark for not multiplying by 100?
No i have seen on previous mark schemes they will allow it

Reply 976

mattyk5

wheres the unofficial mark scheme at for edexcel s1.........

Reply 977

mbh16

did anyone get 0 for one of the probability questions?

Reply 978

WashingPowder

Its very similar to this question from the June 2014(AIL) which luckily i did last night. But you basically , for the question above you would do 27 * P(D | M n S) + 36 * P(D | M n S') to find the total that had desserts

Original post by Avocado2002

How did you work out the number of diners?