When and how to collect feces for analysis correct?

When and how to collect feces for analysis correct?Sterile containers as important?

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What is normally distributed random variables ?

What is normally distributed random variables ? Why is it normal ?What else are abnormal distribution ?

How to solve the problem of the analysis of the geometric shapes ?

Computer thinks of one of the geometric shapes on a plane: a triangle, rectangle, circle, square.figure size is not limited, but not more than the screen size.The subject is the figure does not appear and was not called.

On each of the subsequent steps, the computer displays one of the points on the perimeter of the figure (adding to the previously displayed).The first point is randomly placed, each successive removed from the previous no more than 1/2 of the perimeter of the figure and not less than 1/4 of the perimeter clockwise.

Can accurately determine the shape zagadannuyu At what stage?

There a formal proof?