Answer: B. 
Step-by-step explanation:
Given : A number cube is rolled with these results:
64 ones, 67 twos, 73 threes, 59 fours, 72 fives, and 71 sixes.
Even numbers : 2,4,6
The number of times of rolling even number = 
Total outcomes = 
Now, the experimental probability of rolling an even number :-

In percent, 
Hence, the experimental probability of rolling an even number = 