Edexcel S1 2020 June — Question 1

Exam BoardEdexcel
ModuleS1 (Statistics 1)
Year2020
SessionJune
TopicDiscrete Probability Distributions
TypeCalculate E(X) from given distribution
  1. The discrete random variable \(X\) takes the values \(- 1,2,3,4\) and 7 only.
Given that $$\mathrm { P } ( X = x ) = \frac { 8 - x } { k } \text { for } x = - 1,2,3,4 \text { and } 7$$ find the value of \(\mathrm { E } ( X )\)
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