On the Gulf Freeway at 7:00 AM, the average travel time from Beltway 8 to Downtown is 29.5 minutes with a standard deviation of 11.2 minutes. The distribution of travel travel times is approximately normal.  What is the probaility of a random day that the travel time will be less than 20 minutes? 4 decimal places not in percentage.

Mario scored 82 on his history final. The class mean was 78 with a standard deviation of 3 points. He scored 72 on his biology final with a mean score of 65 and a standard deviation of 5 points. Which grade was better compared with the class mean referencing a normal distribution?   a. The biology test is better. The z-scores for the biology exam and the history exam respectively are 1.4 and 1.33.   b. The biology test is better. The z-scores for the biology exam and the history exam respectively are 1.33 and 1.4.   c. The history test is better. The z-scores for the biology exam and the history exam respectively are 1.33and 1.4.   d. The history test is better. The z-scores for the biology exam and the history exam respectively are 1.4 and 1.33.

My Physics professor announced that top 18% will get A in the class.               Class mean is 72, and standard deviation is 6. To get the grade A, what score should I get at least?

The distribution of heights of adult men is approximately normal with mean 69 inches and standard deviation 2.5 inches. Bob's height has a Z-score of -2.5 when compared to all adult men. In 1-2 sentences, interpret what this Z score tells about how Bob compares to other men in terms of height.