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Elongation (in %) of steel plates treated with aluminium are random with probability density function
f(x)={x/250 20<x<30 and 0 otherwise
a)What proportin of steel plates have elongations greater than 25 %?
b)Find the mean elongation.
c)Find the variance of the elongations.
d)Find the standard deviation of the elongations.
e)Find the cumulative distribution function of the elongations.
f)A particular plate elongates 28%. What proportion of plates elongate more than this?
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