At a local university, when scheduling classes, the probability that there are no evening classes available on a certain day is 0.80. what is that probability that there is at least one evening class available on that day?
Write one a number as your answer. Round to two decimal places (for example: 0.73). Do not write as a percentage.
Pls help!
1 - .80 = ?
To solve this problem, we can use the concept of complement probability. Complement probability states that the probability of an event occurring plus the probability of the event not occurring is equal to 1.
Let's denote the event of no evening classes available as A, and the event of at least one evening class available as A'. We are given that the probability of event A occurring is 0.80.
According to the complement probability, the probability of event A' occurring is:
P(A') = 1 - P(A)
Substituting the value of P(A) given in the problem:
P(A') = 1 - 0.80
P(A') = 0.20
Therefore, the probability that there is at least one evening class available on that day (event A') is 0.20.
So, the answer is 0.20.