A security sensor functions correctly on any given day with probability
MATHEMATICS · Single correct · A Level · Mathematics · Probability · Probability
Problem
A security sensor functions correctly on any given day with probability 0.9, independently of other days. The sensor was observed to be working on Monday. What is the probability that it fails at least once during the next three days (Tuesday to Thursday)?
(a) 0.344
(b) 0.729
(c) 0.271
(d) 0.243