Snooker surroundings or in public snooker halls. The game can also be played on smaller tables using fewer red balls. The variants in table size are: 10 ft × 5 ft, 9 ft × 4.5 ft, 8 ft × 4 ft, 6 ft × 3 ft (the smallest for realistic play) and 4 ft × 2 ft. Smaller tables can come in a variety of styles, such as fold-away or dining-table convertible. A traditional snooker scoreboard resembles an abacus, and records units, tens and hundreds via horizontal sliding pointers. They are typically attached to a wall by the snooker table. A
Standard normal table probability that a statistic is between 0 (the mean) and Z. Note that for z = 1, 2, 3, one obtains (after multiplying by 2 to account for the [-z,z] interval) the results f(z) = 0.6827, 0.9545, 0.9974, characteristic of the 68–95–99.7 rule. This table gives a probability that a statistic is less than Z (i.e. between negative infinity and Z). The values are calculated using the cumulative distribution function of a standard normal distribution with mean of zero and standard deviation of one, usually denoted with the capital Greek letter formula_4 (phi), is the integral formula_4(z) is related to