A car salesman has a .2 probability of selling a car (or more than one car) each day. In 100 days the salesman expects to sell cars on how many days? . The standard deviation for the number of days...

A car salesman has a .2 probability of selling a car (or more than one car) each day.  In 100 days the salesman expects to sell cars on how many days?  .   The standard deviation for the number of days that cars are sold on is?

[The important thing is the day and whether you sell at least one car or not.]