A-Level
EDEXCEL
Mathematics & Further Mathematics
January 2019
QP-201901-Mathematics-US1 · Question 2
Question (excerpt):
4 2. The discrete random variable X has the following probability distribution. x −2 −1 0 1 3 P(X = x) 0.15 a b a 0.4 (a) Find E(X ). (2) Given that E(X 2) = 4.54 (b) find the value of a and the value…
4 2. The discrete random variable X has the following probability distribution. x −2 −1 0 1 3 P(X = x) 0.15 a b a 0.4 (a) Find E(X ). (2) Given that E(X 2) = 4.54 (b) find the value of a and the value…
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