Define mean deviation and standard deviation.

The standard deviation is simply the square root of the variance. The average deviation, also called the mean absolute deviation, is another measure of variability. To calculate the average deviation, simply subtract the mean from each value, then sum and average the absolute values of the differences.

a triangular prism is a 3 dimensional shape composed of triangles and rectangles. it is made from two triangular bases and three rectangular sides.  

“ a line segment that has the endpoints on the circle and passes through the midpoint is called the diameter. the diameter is twice the size of the radius. a line segment that has its endpoints on the circular border but does not pass through the midpoint is called a chord. a circle is the same as 360 small circle up the number 0 . i hope this .