30% of students mean 30 students wear contact lenses from a random selection of 100 students studying in a university.
Percentage is a fraction or a ratio of a random sample in which the value of whole is always 100. For example, if Sam received 30% on his arithmetic test, he received 30 points out of 100. It is expressed as 30/100 in fractional form and 30:100 in ratio form.
Percentage is defined as a certain fraction or number out of a hundred. It is a fraction with the denominator 100, and the sign for it is "%."
Finding the proportion of a whole in terms of 100 is the goal of percentage calculations. There are two methods to calculate a percentage:
Use the unitary approach or try adjusting the fraction's denominator to 100.
How to solve?
30 % = 30/100 of a sample = 0.3 of a sample
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