Answer:
Probability of students will prefer ice-skating over roller - skating = 50 % or 1/2 %
Explanation:
No. of 13 yrs old students = 10
No. of those students prefer ice - skating = 5
Probability of students will prefer ice-skating over roller - skating = No. of 13 yrs old students/ No. of those students prefer ice - skating
P = 5 / 10 = 1/2 % = 50 %