A survey by Pew Research Center asked a random sample of adult Americans whether it would be hard to give up social media. The survey results by age groups is given below.

3) A survey by Pew Research Center asked a random sample of adult Americans whether it would be hard to give up social media. The survey results by age groups is given below. Hard to give up Not hard to give up | Total 18-24 102 98 200 25-29 80 120 200 30-49 86 114 200 50+ 66 134 200 Total 334 466 800 a) (4 points) Compute the marginal probabilities b) (4 points) Show whether events "age group 30-49" and "hard to give up" are independent (show all work)