|A 3 The continuous random variable X has probability density function given by fx(x) = c(1 - x*), -Isxs1, where c is a suitable constant. i. Show that e = % and plot the graph of fx(x) against x. ii. Show that the cumulative distribution function of X is given by x <-1 2+3x-x3 Fx(x) = -1 sxs1 4 1 x > 1 Also find P (-sxs). iii. Obtain the standard deviation of X, to 3 significant figures.

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|A 3
The continuous random variable X has probability density function given by
fx(x) = c(1– x²),
-ISxs1,
where c is a suitable constant.
i. Show that c = 4 and plot the graph of fx(x) against x.
ii.
Show that the cumulative distribution function of X is given by
x<-1
2+ 3x – x3
Fx (x)
-1 <x<1
4
x>1
Also find P (-<x <).
iii.
Obtain the standard deviation of X, to 3 significant figures.
Transcribed Image Text:|A 3 The continuous random variable X has probability density function given by fx(x) = c(1– x²), -ISxs1, where c is a suitable constant. i. Show that c = 4 and plot the graph of fx(x) against x. ii. Show that the cumulative distribution function of X is given by x<-1 2+ 3x – x3 Fx (x) -1 <x<1 4 x>1 Also find P (-<x <). iii. Obtain the standard deviation of X, to 3 significant figures.
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