Lesson: Prediction Using Probability

A random sample of 80 school students were asked to vote for their preferred sport and the results are shown in the table. If the whole school contains 700 students, how many are expected to prefer football?

A survey of 80 students found that 40 students preferred biology, 24 preferred chemistry, and 16 preferred physics. If there are 200 students in the whole school, how many are expected to prefer biology based on the results of the survey?

A sample of 330 people was taken to study the level of education of members in a society. If the ratio of males to females in the sample is , find the number of males in the sample.