ISRO | ISRO CS 2018 | Question 11

In unit testing of a module, it is found that for a set of test data, at the maximum 90% of the code alone were tested with the probability of success 0.9. The reliability of the module is

(A) Greater than 0.9
(B) Equal to 0.9
(C) At most 0.81
(D) At least 0.81

Answer: (C)
Explanation: Code tested maximum 90% = 0.9

Probability of success = 0.9

So, reliability of the module = atmost 0.9 * 0.9 = 0.81

Option (C) is correct.
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