The weekly repair cost, X, for a certain machine has a probability density function given by 6x(1 – x), 0

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5.15 The weekly repair cost, X, for a certain machine has a probability density function given by
6x(1 – x), 0<x<1
0 <x<
f (x) =
0,
otherwise
with measurements in $100s.
D.
Find the mean and variance of the distribution of repair costs.
q.
Find an interval within which these weekly repair costs should lie at least 75% of the time using
Tchebysheff's Theorem.
C Find an interval within which these weekly repair costs lie exactly 75% of the time with exactly
half of those not lying in the interval above the upper limit and the other half below the lower
limit. Compare this interval to the one obtained in part (b).
Transcribed Image Text:5.15 The weekly repair cost, X, for a certain machine has a probability density function given by 6x(1 – x), 0<x<1 0 <x< f (x) = 0, otherwise with measurements in $100s. D. Find the mean and variance of the distribution of repair costs. q. Find an interval within which these weekly repair costs should lie at least 75% of the time using Tchebysheff's Theorem. C Find an interval within which these weekly repair costs lie exactly 75% of the time with exactly half of those not lying in the interval above the upper limit and the other half below the lower limit. Compare this interval to the one obtained in part (b).
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