Compare the number of coin groups with at least one coin heads up to the total number of groups.
D
Practice makes perfect
Kaya tosses 3 coins at the same time and repeats the process nine more times, resulting in a total of 10 trials. Her results are shown in the following picture. H represents heads and T represents tails.
We are asked to find the probability, based on Kaya's experiment, that at least one coin of the group of 3 coins will land heads up. First, let's find the number of groups with at least one heads.
We can see that the number of groups with at least one coin that landed heads up is 9. To find the experimental probability we will divide 9 by the total number of trials, which is 10.
P(At least one heads)=9/10=0.9
This result corresponds with option D.
