5.2 Table shows the percentage frequency table for the petrol brand most preferred by 50 motorists who live in Cape Town. Petrol preference counts Percentages 13 26% Caltex 9 18% Engen 6 12% Shell 22 44% Total 50 100% 5.2.1 What is the probability that a randomly selected motorist prefers Engen? (5) // ///
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- Cal Poly Pomona found that 15% of its students withdraw without completing Calculus I course. Assume that 30 students registered for the course. Let X be the number of students who withdraw. What distribution does X follow?A study reveals that 82% relationships end in the first two years. A random sample of 100 newly formed couples isselected.a. What is the probability that the sample proportion is less than 0.80?b. What is the probability that the sample proportion is within ±0.02 of the population proportion?A researcher asks a sample of people about their attitudes toward marijuana legalization and concludes people have a wide variety of opinions, and are equally likely to be anywhere between strongly in favor of it to strongly opposed to it. She reaches this conclusion because the shape of the distribution is
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