Vals were a) How many 18-year old
students took part in
the survey?
rold students
b) How many more 18-year
old students than 12-year
old students spent
between 25 and 35 mins
on social media?

Abag contains 4 red, 7 blue and 5 yellow marbles. event a is defined as drawing a yellow marble on the first draw and event b is defined as drawing a blue marble on the second draw. if two marbles are drawn from the bag, one after the other and not replaced, what is p(b|a) expressed in simplest form? a. 7/16 b. 7/15 c. 14/16 d. 14/15