Billiard table mm), though commonly referred to as 12 ft by 6 ft. Smaller tables, approximately 10 ft by 5 ft down to half size, are also sometimes used in pubs, homes and smaller snooker halls. The height from the floor to the top of the cushion is between 2 ft 9.5 in and 2 ft 10.5 in (85.1 cm and 87.6 cm). A snooker table has six pockets, one at each corner and one at the center of each of the longest side cushions. The pockets are around 86 mm (3.5 in), though high-class tournaments may use slightly smaller pockets to
Standard normal table the standard normal table to find probabilities. Normal distributions are symmetrical, bell-shaped distributions that are useful in describing real-world data. The "standard" normal distribution, represented by the letter Z, is the normal distribution having a mean of 0 and a standard deviation of 1. If "X" is a random variable from a normal distribution with mean μ and standard deviation σ, its Z-score may be calculated from X by subtracting μ and dividing by the standard deviation: For the average of a sample of size n from some population in which the mean is μ and the standard deviation is