CAIE S2 2020 Specimen — Question 5

Exam BoardCAIE
ModuleS2 (Statistics 2)
Year2020
SessionSpecimen
TopicContinuous Probability Distributions and Random Variables
TypeSymmetry property of PDF

5
\includegraphics[max width=\textwidth, alt={}, center]{8f62635a-2998-468f-8017-0db050d612be-08_270_648_251_712} Th diag am sh s th g a to th pb ab lityd nsityf n tiff, to a rach \& riab e \(X\),w b re $$f ( x ) = \begin{cases} \frac { 2 } { 9 } \left( 3 x - x ^ { 2 } \right) & 0 \leqslant x \leqslant 3
0 & \text { otherwise } \end{cases}$$
  1. State th \& le \(6 \mathrm { E } ( X )\) aff id \(\operatorname { Var } ( X )\).
  2. State th le \(6 \mathrm { P } (
    ) \leqslant X \leqslant 4\(.
  3. Giv it h \)\mathrm { P } \left( 1 \leqslant X \leqslant \mathcal { P } = \frac { 13 } { 27 } \right.\(, f idP \)( X > \mathcal { P }$.