
Mark M. answered 05/05/15
Tutor
5.0
(278)
Mathematics Teacher - NCLB Highly Qualified
Well, this is not a Trig problem. It is about statistics.
Obtain a z-score table:
http://www.utdallas.edu/dept/abp/zscoretable.pdf
95% of the heights are below a z-score of 1.65
1.65 = (X - 54) / 3.5
5.775 = X - 54
59.775 = X
95% of the girls are shorter than 59.775 inches.