Table 13-1
The table below represents the probability distribution for machine breakdowns in a day of operation.
-According to Table 13-1,what is the probability of at least one breakdown?
A)0.2
B)0.3
C)0.5
D)0.8
E)0.85

Question

Table 13-1
The table below represents the probability distribution for machine breakdowns in a day of operation. 
-According to Table 13-1,what is the probability of at least one breakdown?
A)0.2 
B)0.3 
C)0.5 
D)0.8 
E)0.85

Quizplus · Accepted Answer

To find the probability of at least one breakdown, we need to add up the probabilities of one, two, and three breakdowns. 
P(at least one breakdown) = P(1) + P(2) + P(3) = 0.5 + 0.3 + 0.05 = 0.85 
Therefore the probability of at least one breakdown is 0.85, which corresponds to choice D.

Table 13-1 The Table Below Represents the Probability Distribution for Machine Breakdowns