Fifteen 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? The probability is nothing.

Question

Mathematics

Macey Juarez

1 January, 16:07

Fifteen 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? The probability is nothing.

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Answers (2)

Know the Answer?

Mary Andrade · Answer 1

0.85

Step-by-step explanation:

Given;

Number of defective DVRs D = 15

Total number of DVRs T = 100

Number of non defective DVR N = T - D = 100 - 15 = 85

The probability of selecting a non defective DVR P (N) is equal to the number of non defective DVR divided by the total number of DVRs.

P (N) = N/T

Substituting the values;

P (N) = 85/100

P (N) = 17/20 = 0.85

Desirae Bishop · Answer 2

17/20

Step-by-step explanation:

Fifteen of the 100 digital video recorders (DVRs) in an inventory are known to be defective, the total number of non-defective DVRs will be 100-15 = 85 DVRs.

If 85 DVRs are not defective, the probability that you randomly select a DVR that is not defective can be expressed as:

P (non-defective DVRs) = Total number of non-defective DVRs / Total DVRs

P (non-defective DVRs) = 85/100

P (non-defective DVRs) = 17/20