Answer:
0.2060 = 20.60% probability that 2 or fewer will withdraw
Step-by-step explanation:
For each student, there are only two possible outcomes. Either they withdraw, or they do not. The probability of a student withdrawing is independent from other students. So we use the binomial probability distribution to solve this question.
Binomial probability distribution
The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.
In which is the number of different combinations of x objects from a set of n elements, given by the following formula.
And p is the probability of X happening.
20% of its students withdraw without completing the introductory statistics course.
This means that
Assume that 20 students registered for the course.
This means that
Compute the probability that 2 or fewer will withdraw (to 4 decimals).
In which
0.2060 = 20.60% probability that 2 or fewer will withdraw
7,14,21,28,35,42,49,56,63,70,77,84