Billiard table all six pockets), with rounded entrances and nearly parallel sides, like those on a snooker table. One tactical consequence of this design difference is that the jaws of the WPA-type pocket are often used exactly like a horizontal version of the backboard of a basketball goal, to rebound the ball into the pocket; this technique does not work on blackball tables, and even shots down the cushion into a corner pocket are more difficult. For tournament competition under WPA world-standardized rules (and league play under derived rulesets), the bed of the pocket billiard table must be made of slate no
Standard normal table the error function, or erf("z"). This table gives a probability that a statistic is greater than Z. This table gives a probability that a statistic is greater than Z, for large integer Z values. A professor's exam scores are approximately distributed normally with mean 80 and standard deviation 5. Only a "cumulative from mean" table is available. Standard normal table A standard normal table, also called the unit normal table or Z table, is a mathematical table for the values of Φ, which are the values of the cumulative distribution function of the normal distribution. It is used to find