Apopulation of scores has a mean of 50 and standard deviation of 10. this population is normally distributed. therefore, 95% of the scores in the distribution should fall between and

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.

18

step-by-step explanation:

draw the shape and you will see that f and k are actually at adjacent vertices (points of the hexagon that are neighboring).   so find the distance between (1,2) and (4,2).   that is easy since (1,2) and (4,2) is just a vertical distance to count, which is 3.   it is a regular polygon which means all sides are congruent.   you have 6 sides (hexa) so multiply 6 by 3 to receive 18.