Which formula gives the standard deviation of a data set

you need to make an explanation. so, since you did not include one, so no one, and i mean no one can unfortunately you,

you should start by saying what they did to these subjects hope that this

  this riddles' answer is library.

  the "leaves" are a reference to the books' pages that the library contains; the branches are a network of libraries that connect multiple libraries' collections, resources, and items in a system of a common database, integrating them; the branches' organization are a useful management tool for coordinating the multiple collections many libraries have.

c is the answer because first she would blush to make the reader wonder why which they find out in the next line.