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    Hi,
    I've been practicing this paper and I don't understand how to answer question 6a . The mark scheme answers it by using f(4)=1 but i don't understand why

    Can anyone help please?

    The question paper

    Mark Scheme

    Thank You!
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    Because it's cumulative, the last box has to equal 1. 25/25=1 so (4+k)^2 must equal 25
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    (Original post by Xara202)
    ...
    Since X can only take values for x=2,3,4. Then P(X<=4) = 1, but P(X<=4)= F(4), hence....
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    (Original post by Naomiimoan)
    Because it's cumulative, the last box has to equal 1. 25/25=1 so (4+k)^2 must equal 25
    Ah, I remember learning that but I completely forgot lol
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    (Original post by Xara202)
    Ah, I remember learning that but I completely forgot lol
    Thank You
    No probs
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    what the ef is a explanatory variable?
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    for 7c why do u times it by 3?
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    (Original post by Xara202)
    Hi,
    I've been practicing this paper and I don't understand how to answer question 6a . The mark scheme answers it by using f(4)=1 but i don't understand why

    Can anyone help please?

    The question paper

    Mark Scheme

    Thank You!

    can u help me answer q6 b? how do i do it?
 
 
 
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