A Covid 19 testing machine at a testing centre breaks down an average of three times per year. Using an appropriate probability distribution formula, find the probability that during the next year, this machine will have;
i. exactly two breakdowns
ii. at most one breakdown
solution:
The number of successes in two disjoint time intervals is independent. The probability of a success during a small time interval is proportional to the entire length of the time interval
given : = 3
Formula: P(X=x)=
part i)
Exactly two breakdowns
P(x=2)= = 0.2240
Part ii)
At most one breakdown:
P(X 1)= P(X=0)+P(x=1)
= +
=0.0498+0.1494
=0.1992
Comments
Leave a comment