Question

Type	Probability
1 ton	0.12
2 tons	0.14
5 tons	0.17
10 tons	0.08
20 tons	0.49

An appliance dealer sells 5 types of air conditioners. The above gives the distribution of the random variable X - tonnage of air conditioner bought by a customer

What is E(X)? [Answer 2 digits after decimal] 11.85

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以前的尝试

What is σ(X)? [Answer 3 digits after decimal]

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The air conditioners are priced by the retailer at 200 dollars per ton. The retailer pays 100 dollars per ton to buy the air conditioners. In addition there is an overhead cost of 50 dollars per air conditioner. What is the expected value of the profit for the retailer from the sale of an air conditioner? [Answer 2 digits after decimal]

错误.

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以前的尝试

The air conditioners are priced by the retailer at 200 dollars per ton. The retailer pays 100 dollars per ton to buy the air conditioners. In addition there is an overhead cost of 50 dollars per air conditioner. What is the standard deviation of the profit for the retailer from the sale of an air conditioner? [Answer 2 digits after decimal]

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Answer 1