The annual returns, in percentages, on stocks A and B for three possible...

1.The annual returns, in percentages, on stocks A and B for three possible states of the economy are given in the table below.

Economy State   Probability   StockA   StockB
Good      0.5   40   20
Average      0.3   20   40
Bad      0.2   10   8

If one invested in StockA, what would be the standard deviation of the percentage return? Place your answer, in percent rounded to 1 decimal place, in the blank. For example, a standard deviation of 10.39 percent would be reported as 10.4. Do not use a percent sign.  

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2.Mothers Against Drunk Driving (MADD) is a very visible group whose main focus is to educate the public about the harm caused by drunk drivers. A study was recently done that emphasized the problem we all face with drinking and driving. Five hundred accidents that occurred on a Saturday night were analyzed. Two items noted were the number of vehicles involved and whether alcohol played a role in the accident. The numbers are shown below:
Number of Vehicles Involved
Did alcohol play a role?   1   2   3
Yes         60   110   30   200
No         40   215   45   300
         100   325   75   

Given that multiple vehicles were involved, what proportion of accidents involved alcohol?
Place your answer, rounded to 2 decimal places, in the blank. For example, 0.23 is a legitimate entry.  

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