Edexcel Statistics S1 June 2011 Q8g : ExamSolutions

[MrTitration]

Then how come on the previous question with tom, the mark scheme accepted 4, 4, 4 ? That is over 12 and the wording is exactly the same apart from the name.

[jiggowpoifjdfu]

By saying not 5 he considers all values so sample space would be like that
515
155
525
255
545
455
055
505

[ExamSolutions_Maths]

Because you would have scored 10 and won in 2 goes so a third go was not necessary. The game would have stopped.

[RgYeEun]

it's a fair spinner so it can land on any of the other numbers. on his 1st or 2nd spin if it lands on an even number, he can still win with 10 tokens. I think that's why we have to consider it not 5. Hope that clears out something for you

[ExamSolutions_Maths]

Debatable. I would say yes but others might disagree. As you say, it did not affect the answer.

[ExamSolutions_Maths]

I counted that in when I said (5, not 5, and then 5)

[AnonymousSquidGuy]

What i dont understand is why he used 0.8 because not 5 only applies to the odd numbers because its jess

[RgYeEun]

thanks for the help. I was so confused when I checked my answer on the mark scheme

[mkksindia]

he can use only odd numbers to win so why are you using 0, 2 and 4 to calculate probability? Why probability can't be P(1, 5, 5)+P(5, 1, 5) only? I am unable to understand logic of using "not 5"?

[xxAnaconta]

its the same thing only instead of putting 1, 2, 0 and 4 he replaced them with 0.8

[mkksindia]

why not P(1, 5, 5)+P(5, 1, 5)? WHY R U CONSIDERING 0, 2 AND 4?

[ZynxizeGaming]

exactly, thats what i was thinking. Stuart please help :(

[xboxlive]

Can't it be two 5s and a not 5 multiplied by 3 ?

[deborahniati]

Why can't you get a 1 5 5 or 5 1 5?

[AliFrostinho]

Basically without 2 5's, she can't win. So this is the best way of calculating the probability.

[AV]

OMG PLEASE HELP Y NOT USE 1, 5, 5 OR 5, 1, 5 THIS IS SOOO CONFUSING

[xboxlive]

Nvm I get it. ..it has to be AFTER 3 spins