A-Level
EDEXCEL
Mathematics & Further Mathematics
June 2021
QP-202106-Mathematics-US1 · Question 5
Question (excerpt):
14 5. The discrete random variable X has the following probability distribution x −2 −1 0 1 4 P(X = x) a b c b a Given that E(X ) = 0.5 (a) find the value of a. (2) Given also that Var(X ) = 5.01 (b) …
14 5. The discrete random variable X has the following probability distribution x −2 −1 0 1 4 P(X = x) a b c b a Given that E(X ) = 0.5 (a) find the value of a. (2) Given also that Var(X ) = 5.01 (b) …
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