Five out of twenty students wear glasses what is the probability that a student selected at random does not wear glasses
15/20 = 3/4
To find the probability that a student selected at random does not wear glasses, we need to calculate the ratio of the number of students who do not wear glasses to the total number of students.
Given that five out of twenty students wear glasses, we can conclude that fifteen students out of twenty do not wear glasses (since 20 - 5 = 15). Therefore, the probability that a student selected at random does not wear glasses is 15 out of 20.
To express this probability as a decimal or fraction, we can reduce the ratio. Both 15 and 20 are divisible by 5, so dividing both numbers by 5 gives us 3/4.
Therefore, the probability that a student selected at random does not wear glasses is 15/20 or 3/4, which is equivalent to 75%.