Paper 7 October/November 2011 MATHEMATICS (9709/73) A Levels
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Each of the random variables $T$, $U$, $V$, $W$, $X$, $Y$ and $Z$ takes values between 0 and 1 only. Their probability density functions are shown in Figs 1 to 7 respectively.
a)(i) Which of these variables has the largest median?
(ii) Which of these variables has the largest standard deviation? Explain your answer.
b) Use Fig. 2 to find $P\left( {U \lt 0.5} \right)$.
c) The probability density function of $X$ is given…