document.write( "Question 471255: Find the mean and standard deviation of the following probability distribution:
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Algebra.Com's Answer #323373 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( " Find the mean and standard deviation of the following probability distribution
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document.write( "x      1    2   3
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document.write( "P(x)  .3   .4  .3\r
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document.write( "E(x) = 1*.3 +2*.4 +3*.3 = 2
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document.write( "sd = sqrt[(1-2)^2*.3 + (2-2)^2*.4 + (3-2)^2 *.3] = .77 
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