The number of no-sales days for a salesperson during a month is described by the probability distribution shown in Table 2.4. These values are based on the salesperson past experience and will be used to forecast future sales activity.The X column lists all values(no-sales days) that are possible,whereas the P(X) column lists the corresponding probabilities.Note that,since all possible values of X are listed,the probabilities to 1.00,or 100%.This is true for all probability disregarding rounding errors.