a)P(plans to increase) =3072/5086 =0.6040
b) P(B2C marketer) =3306/5086 =0.6500
c) P(B2C or plan to increase )=(3306+3072-1719)/5086 =0.9160
d) b) is a marginal probability of being a B2C marketer, while d) is a combined event ,
PLEASE ANSWER ALL 4 questions :) thank you so much!!!! please include what formulas you used...