Twenty-nine of the 100 digital video recorders (DVRs) in an inventory are known to be defective. What is the probability you randomly select a DVR that is not defective?

Step 1 ：Given that there are 100 digital video recorders (DVRs) in an inventory, out of which 29 are known to be defective.

Step 2 ：Let's denote the number of defective DVRs as \(d\), the total number of DVRs as \(t\), and the number of non-defective DVRs as \(n\).

Step 3 ：So, \(d = 29\), \(t = 100\), and \(n = t - d = 100 - 29 = 71\).

Step 4 ：The probability of an event is calculated by dividing the number of ways the event can occur by the total number of outcomes.

Step 5 ：In this case, the event is selecting a DVR that is not defective, and the total number of outcomes is the total number of DVRs in the inventory.

Step 6 ：So, the probability \(P\) of selecting a non-defective DVR is \(P = \frac{n}{t} = \frac{71}{100} = 0.71\).

Step 7 ：Final Answer: The probability of randomly selecting a DVR that is not defective is \(\boxed{0.71}\).