D. , this is a good way because this way you can easily multiply and then you'll see your answer right in front of you.
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Since 20 is a factor of 40, the least common denominator of 3/20 and 9/40 is 40.
Answer:
0.1536
Step-by-step explanation:
The computation of probability that the building failure will occur over its life is shown below:-
P(building failure) is

now we will solve the above equation
= 0.18 - 0.0264
After solving the above equation we will get
= 0.1536
Therefore for computing the probability that the building failure will occur over its life we simply applied the above formula.
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