Last week , former chief financial officer Franklyn Bergonzi pleaded guilty to one count of conspiracy and agreed to cooperate with the government 's investigation .
Former company chief financial officer Franklyn M. Bergonzi pleaded guilty to one count of conspiracy on June 5 and agreed to cooperate with prosecutors .
the square root of the average of the squared deviations from the mean; it is the typical amount that each score varies, or deviates, from the mean