The survey asked 948 adults how they would grade the quality of their public schools. Each person gave one response. Find each probability.  
A: 48  B: 238 C: 304  D: 250  F: 108  
(a) Randomly selecting a person from the sample who did not give the public schools an A
​(b) Randomly selecting a person from the sample who gave the public schools a grade better than a D
​(c) Randomly selecting a person from the sample who gave the public schools a D or an F
​(d) Randomly selecting a person from the sample who gave the public schools an A or B