Problem 887

The  life expectancy  of a certain type of  computer chip is a continuous random variable with probability density function.

\begin{Bmatrix}  \frac{4}{(x+4)^{2}}x\geq 0 & \\  0 -> otherwise&  \end{Bmatrix}

Find the probability that a randomly selected chip will last from three to seven years.

 

Solution:-

 

0.21

 

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