The given table shows the ages (in years) of 360 patients, getting medical treatment in a hospital. Age n years) 10-20 20-30 30-40 40-50 50-60 60-70 No. of patients 90 50 60 80 50 30 One of the patients is selected at random. The probability that his age is (a) 30 years or more but less than 40 years is ____. (b) 10 years or more is ___.

• A. (a) (b) \[\frac{1}{6}\] \[\frac{2}{9}\]            
• B. (a) (b) \[\frac{1}{6}\] 0            
• C. (a) (b) \[\frac{2}{9}\] 1            
• D. (a) (b) \[\frac{1}{6}\] 1