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MathNet 2015-part-06 — 191 problems (EN–VI) Question 76

Math Olympiad Vault · MathNet 2015-part-06 — 191 problems (EN–VI)

Question 76

Eskom announces that there is a 60% chance of Stage 1 load shedding for a specific week.
In a specific suburb Stage 1 load shedding is from 10:00 to 12:30 on a Monday, Wednesday, Friday and Sunday. What is the probability that in that specific suburb there will be load shedding at a moment in the week, without knowing the day, or time or whether or not it is day or night?