vini1900 Posted October 13, 2013 Share Posted October 13, 2013 In a graduation class of a certain college 48% of students are males and 52% are females. In this class 40% of the males and 20% of the female students are 20 yrs or older. If one student in the graduating class is randomly selected approximately, what is the probability that he or she will be less than 25 yrs old? A) 0.90 B) 0.70 C) 0.45 D) 0.30 E) 0.25 Thanks! Quote Link to comment Share on other sites More sharing options...
YaSvoboden Posted October 17, 2013 Share Posted October 17, 2013 So, 40% of the 48% that are males are 25 or over and 20% of the females. 0.48*0.4+0.52*0.2 = .296. This is the total percentage that is 25 or older. That means that 1-.296 are then 25, or about .7. Because the answers are so spread out on this question I would probably just approximate and multiply .5*.4 and .5*.2 to get 30% and get the 70% from there. Quote Link to comment Share on other sites More sharing options...
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