1. What is the probability that exactly 9 out of the eighteen have concerns about banking using online banking apps on smart phones?

2. What is the probability that at least 9 out of the eighteen have concerns about banking using online banking apps on smart phones?

3. What is the probability that at most 9 out of the eighteen have concerns about banking using online banking apps on smart phones?

4. Find the mean for this binomial distribution

5. Find the standard deviation for this binomial distribution

 

Consider the following binomial distribution. In a local community, 72% of adults have concerns about banking using online banking apps on smart phones. Suppose 18 adults are randomly selected from the community. Let the random variable x be the number of adults among the eighteen who have concerns about banking using online banking apps on smart phones. Let x denote the random variable. So x can be 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 or 18.