OCR S1 2007 January — Question 1

Exam BoardOCR
ModuleS1 (Statistics 1)
Year2007
SessionJanuary
TopicDiscrete Probability Distributions
TypeOne unknown from sum constraint only
1 Part of the probability distribution of a variable, \(X\), is given in the table.
\(x\)0123
\(\mathrm { P } ( X = x )\)\(\frac { 3 } { 10 }\)\(\frac { 1 } { 5 }\)\(\frac { 2 } { 5 }\)
  1. Find \(\mathrm { P } ( X = 0 )\).
  2. Find \(\mathrm { E } ( X )\).
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