In the world of marbles the larger shooter marbles are called taws and the smaller marbles that one tries to hit out of the circle are called ducks. The later term refers to the marbles being "sitting ducks" which do not move. Ducks do not all have the same mass in grams, each duck differs due to the manufacturing process. Twenty-six ducks were massed and found to have a mean mass of μ = 5.22 grams with a standard deviation of σ = 0.59 grams. Presume the distribution is normal for duck masses.
|Statistic or Parameter||Symbol||Equations||OpenOffice.org Calc|
|Formula to calculate a z value from an x value||z||=STANDARDIZE(x;μ;σ)|
|Find a probability p (the area to the left of x) from an x value||=NORMDIST(x;μ;σ;1)|
|Find an x value from a probability p (the area to the left of p)||=NORMINV(p;μ;σ)|