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S1 WJEC/GCE 15 June 2010

How did everyone find the exam? I thought the e^-o.6t question was hard and the last one I couldn't work out the median :s
how did you guys find it?
Reply 1
Avatar for scouse92
scouse92
i thought it was ok.

the mean was

m^4-2m^2=0.5

so by expanding (m^2-1)^2 you get m^4-2m^2+1

so making it the same you have to minus 0.5

so (m^2-1)^2= 0.5

square root both sides

M^2-1= root2/2
m^2= 1- root2/2

then square root it to get mean as 0.541.

anyone got the paper with the answers now??
Reply 2
Avatar for ethanhenry
ethanhenry
can soemone please put up what they know to be the answers? i know Q.2 was:

a)
E(Y)=11
Var(Y)=18

b)
E(Y^2)=139
Reply 3
Avatar for whatajoker
whatajoker
How did you get 139?

I got 47,

4x4x3-1=47 (You square the mean then use it in the E(y) Equation)

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