Final answer:
The probability that Sarah will be picked is calculated by dividing the number of favorable outcomes (1, since there's only one Sarah) by the total number of possible outcomes (24 students in the class).
Step-by-step explanation:
To find the probability that Sarah will be the student picked to take attendance in Miss Mooney's class, we can use the concept of simple probability. Since there are 24 students in total (12 boys and 12 girls) and only one student will be chosen, the probability is the number of favorable outcomes (in this case, Sarah being picked) over the total number of possible outcomes. As there's only one Sarah in the class, the number of favorable outcomes is 1, and the total number of students is 24, so the probability is calculated as 1 divided by 24.