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ok but i dint get the part "Since loss means a profit that is less than zero, we are working P(X<0)"
Profit means .. Total Sales are greater than Total Cost... Sale Price - Cost Price like if you sell a book which you bought for 10$ (cost) for 15$ (sale) you get a profit of 5$..
similarly if you sold the same 10$ item (cost) for 8$ (sale) you have a 2$ loss .. Now use the profit formula .. Sales - Cost = 8-10= -2 .. meaning Negative Profit is loss.. hence less than 0.