Evan measured the length of a set of nails. The mean of lengths was 3 cm. The absolute mean deviation was 1 cm. Which could be Evan's set of nails?
A) 1 cm, 2 cm, 3 cm, 4 cm
B) 2 cm, 2 cm, 3 cm, 5 cm
C) 2 cm, 3 cm, 3 cm, 4 cm
D) 2 cm, 3 cm, 3 cm, 5 cm

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