What is the standard deviation of the data set given bellow? 5,7,9,11,13

Add 1/7 + -1/7 your answer should be reduced to its smallest form and should not be an improper fraction

Given: pqrs is a parallelogram prove: pr and qs bisect each other at t

In the diagram, points d and e are marked by drawing arcs of equal size centered at b such that the arcs intersect ba and bc. then, intersecting arcs of equal size are drawn centered at points d and e. point p is located at the intersection of these arcs. based on this construction, m , and m