The odds of landing on heads and/or tails is 50%.
Explanation:
From my comment post:
A) 1/2 or 50%
B) YOUR experiment
C) YOUR experimental prob of heads is 9 /15= 3/5 = .6 = 60%
D) Small sample size.....more trials and the experimental would likely approach the 50% theoretical
9.4m questions
12.1m answers