ISRO2014-23

Question

The test suite (set of test input) used to perform unit testing on a module could cover 70% of the code. What is the reliability of the module if the probability of success is 0.95 during testing?

• A. 0.665 to 0.95
• B. At the most 0.665
• C. At the most 0.95
• D. At least 0.665

 

Answer 1

Unit testing of the module is covering 70% of the code = 0.7

Probability of success  = 0.95

Reliability = 0.7 * 0.95 = 0.665.

Answer is at the most 0.665.

Please correct me if i am wrong

Comments

thanx

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Right bro.. according to me .. Ans A is more correct.

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what if most (or all errors ) are from that 30 % code which is untested.Then it can not even 0.1  so 0.665 is not guaranteed it is  max we can claim  And even if 30 % does not contain error without testing that code we can not say it is reliable

Answer 2

At the most 0.665

Comments

plzz Explain process to solve it.

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Can u pls explain the above answer

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As it is given that " testing on a module could cover 70% of the code" =>it means it can cover up to 70% of code and we don't know about remaining 30% of code's reliability it didn't mention so we can't consider it.

Maximum reliability on 70% code would be=0.7*0.95(as prob. of success given)=0.665

Suppose if we consider it only 60% code under testing then it would be=0.6*0.95<0.665

so At the most 0.665.