The Social Media and Personal Responsibility Survey found that 69% of parents are “friends” with their children on Facebook. A random sample of 140 parents was selected.

a. Calculate the standard error of the proportion.

b. What is the probability that 100 or more parents from this sample are “ friends” with their children on Facebook?

c. What is the probability that between 96 and 105 parents from this sample are “ friends” with their children on Facebook?

d. If 81 parents responded that they are “ friends” with their children on Facebook, does this result support the findings of the Social Media and Personal Responsibility Survey?