At Central City High, a random sample of n = 350 teenagers 13 to 17 years of age was asked if they use social media, which has been known to increase stress, anxiety, and depression in high school students. Of those surveyed, 245 stated that they do use social media.

a. Find the sample proportion of teenagers 13 to 17 years of age who use social media, ps.

b. You believe this is smaller than the national proportion, p = .77. What is the probability that another of sample of 350 students would have a sample proportion lower than the sample proportion calculated in Part (a). What can you infer from this result?