Final answer:
The estimated probability of obtaining a heads when the coin is tossed is 0.54 or 54%.
Step-by-step explanation:
The probability of obtaining a heads when a fair coin is tossed can be estimated using the results of Sarah's coin toss. In her experiment, the coin landed on heads 108 times out of 200 tosses. To estimate the probability, we divide the number of heads by the total number of tosses:
Probability of heads = Number of heads / Total number of tosses
Probability of heads = 108 / 200
Probability of heads = 0.54
Therefore, the estimated probability of obtaining a heads when the coin is tossed is 0.54 or 54%.