Computer programs are classified by the length of the source code and by the execution time. Programs with more than $150$ lines in the source code are big $($B$).$ Programs with less than or equal to $150$ lines are little $($L$).$ Fast programs $($F$)$ run in less than $0\mathrm{.}1$ seconds. Slow programs $($W$)$ require at least $0\mathrm{.}1$ seconds. The length of source code and the run time are observed in an experiment. The probability model for this experiment contains the following information: Pr$[$LF$]=0\mathrm{.}5,$ Pr$[$BF$]=0\mathrm{.}2,$ and Pr$[$BW$]=0\mathrm{.}2.$ Calculate the following probabilities: