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2 Statistics

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Question 147

x0123P(X=x)0.20.3a0.25\begin{array}{c|rrrr}x&0&1&2&3\\\hline P(X=x)&0.2&0.3&a&0.25\end{array}xP(X=x)​00.2​10.3​2a​30.25​​

a.

Find aaa.

[1]
b.

Find P(X>1.2)P(X>1.2)P(X>1.2).

[1]
c.

Construct a table for the cumulative distribution F(x)=P(X≤x)F(x)=P(X\leq x)F(x)=P(X≤x) at x=0,1,2,3x=0,1,2,3x=0,1,2,3.

[2]
Markscheme

2 Statistics Questions

  1. A Level
  2. /Maths
  3. /2 Statistics

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