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junior college 1 | H2 Maths
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junior college 1 chevron_right H2 Maths chevron_right Singapore

need help with this qn, please explain too

Date Posted: 3 months ago
Views: 76

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Hello student, the mean of X is also the expected value of X, also known as E(X).
Given the E(X) value, you first create an equation that is equal to E(X).

Next, Do note that the probability of all possible outcomes is 1. Thus you can sum up the row of P(X=x) be equals to 1.

After which, you can then solve simultaneous equations for both the equations to get the values of a and b.

Hope that helps!!
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25 answers (A Helpful Person)
3 months ago
i did that and got 0.525 instead...