An electronics store sells a particular model of computer laptop. There are only four laptops in stock, and the manager wonders what today's demand for this particular model will be. She learns from the marketing department that the probability distribu- tion for X, the daily demand for the laptop, is as shown in the table. Find the mean, variance, and standard deviation of X. Is it likely that five or more customers will want to buy a laptop today?

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x 0 1 2 3 4 5 p(x) 0.10 0.40 0.20 0.15 0.10 0.05