Question: The density function of the continuous random variable X, the total number of hours, in units of 100 hours that a family runs a vacuum

The density function of the continuous random variable X, the total number of hours, in units of 100 hours that a family runs a vacuum cleaner over a period of one year, is given in Exercise 3.7. Let

X1 = {1, of the 1st light bulb is defective, 0, otherwise,

X2 = {1, if the 2nd light bulb is defective, o, otherwise, Find the probability that at least one light bulb chosen is defective.

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