Questions 13-15. The confectionery manufacturer "Bon-Bon" believes that 80% of consumers prefer its product to that of its competitor. A sample of 10 consumers is randomly selected by its marketing department to study various aspects of consumption and preference.

Q13) The probability of obtaining exactly 7 consumers in this sample of 10 consumers who prefer the Good Guy product to the competitor's product is : - Nearly 0% - Between 10% and 15 - Between 15% and 20 - Between 20% and 25 - > 25%

Q14) The probability of having at least 2 consumers in this sample of 10 who prefer the competitor's product to "Good-Good" is : - Nearly 30% - Between 35% and 55 - Between 55% and 60 - Between 60% and 65 - > 65%

Q15) The standard deviation of the number of consumers in this sample of 10 who prefer the competitor's product over "Good-Good" is : - Between 1 and 1.5 consumers - Between 1.5 and 2 consumers - Between 2 and 2.5 consumers - Between 2.5 and 3 consumers - > 3 consumers