In a research sample of highschool students, the variable “number of fb friends” formed a normal distribution with a mean of 45 and a standard deviation of 16. valentina had 53 friends. what was her approximate percentile rank?
a) 31st
b) 53rd
c) 69th
d) 49th

the answer is b

answer: the proof is mentioned below.

step-by-step explanation:

since, given:   lines bc = ef

prove:   lines ac > ef

          statements                                           reason

1. bc=ef                                           1. given

2. ac= ab+bc                                 2. because b is the point between the  

                                                            line segment ac

3.   ac > bc                                       3. because if a line segment is equal to

                                                          the sum of two line segments then it is

                                                          always greater then each of these

                                                          individual line segments

4. ac > ef                                         4. by equality property.