CompTIA Security plus Certification Practice test question 3 for exam SY0-401

CompTIA Security+ Practice test – sample question 3

For CompTIA Security+ Certification Exam SY0-401

NOTE: These sample questions are examples of the types of questions you would be seeing on the Security+ exam and in CertBlaster but you would have to be in the software to experience the performance based questions. The CertBlaster test engine provides all the questions types you would see at the exam such as in-simulator questions, drag and drop, list and reorder etc.

Security+ Sample Question 3

The Bonanza Mining Corporation (BMC) has 25,640 hard drive units. On average they were run for 873 hours each and they experienced 21 failures, what is the MTBF for BMC? (Round up your result to the nearest hour).

The correct answer is at the very bottom of this page (to give you a chance to think about it first).

The Bonanza Mining Corporation’s MTBF (mean time between failures) would be 25,640 × 873 hours divided by 21, or 1,065,891 hours (to be very precise: 1,065,891.4 rounded down). This MTBF rating is the metric typically used by corporations to determine the number of spare hard drives that should be kept on hand.

Security+ Exam Objective addressed in above question:
Main Domain 2.0 Compliance and Operational Security  – Sub-objective 2.1 Explain the importance of risk related concepts.

For a complete practice tests series with multiple exam simulations and drills with all question types including simulation based items see our Security+ practice test. It has over 400 practice questions, answers and explanations!


The correct answer is: 1,065,891


4 thoughts on “CompTIA Security plus Certification Practice test question 3 for exam SY0-401

  1. Well, you used two different numbers for the number of hard drive units. The question stated 25,640 and your explanation shows 26640. My answer is 1065892 hrs because there is a .43 and I don’t know whether to round that up or chop it off so I rounded up.

    1. Hi Julie, thanks for catching this! We fixed the typo in question text and explanation they both now say 26,640.

      1. Now you fixed the question and answer for hard drive units but you didn’t fix the actual answer. It’s 1065892

        1. Thanks Joshua! Not sure how the simple math went wrong but it is now corrected as per your feedback.

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