=+35. Skate board sale. A sports shop plans to offer 2 specially priced skate board models at a sidewalk sale. The basic model will return a profit of $120 and the sports model

$150. Past experience indicates that sales of the basic model will have a mean of 5.4 skate boards with a standard deviation of 1.2, and sales of the sports model will have a mean of 3.2 skate boards with a standard deviation of 0.8.

The cost of setting up for the sidewalk sale is $200.