OCR MEI S1 2010 June — Question 2

Exam BoardOCR MEI
ModuleS1 (Statistics 1)
Year2010
SessionJune
TopicDiscrete Probability Distributions
TypeSimple algebraic expression for P(X=x)
2 The probability distribution of the random variable \(X\) is given by the formula $$\mathrm { P } ( X = r ) = k r ( 5 - r ) \text { for } r = 1,2,3,4 .$$
  1. Show that \(k = 0.05\).
  2. Find \(\mathrm { E } ( X )\) and \(\operatorname { Var } ( X )\).
This paper (7 questions)
View full paper
Q1 Q2 Q3 Q4 Q5 Q6 Q7