Answer:
This is a binomial probability problem. We can use the formula for binomial probability, which is:
P(X=k) = C(n, k) * (p^k) * ((1-p)^{n-k})
where:
- P(X=k) is the probability of k successes in n trials,
- C(n, k) is the number of combinations of n items taken k at a time,
- p is the probability of success on a single trial.
Given that the probability of an adult using their smartphone in meetings or classes is 48% or 0.48, and we are selecting 13 adults, we want to find the probability that fewer than 3 of them use their smartphones in meetings or classes. This means we want to find P(X=0) + P(X=1) + P(X=2).
Explanation: