Suppose that the probabilities of a customer purchasing​ 0, 1, or 2 books at a book store are 0.2​, 0.4​, and 0.4​, respectively. what is the expected number of books a customer will​ purchase? the standard deviation of the​ customer’s book purchases is

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The correct answer was given: awdadaddda
Porobability distribution of xx      p(x)0        0.21        0.42        0.4total .1.0i] expectationmean=σxpvariance=x²p-(∑xp)²thus: mean=(0*0.2)+(1*0.4)+(2*0.4)=0+0.4+0.8=1.2ii] variancevariance=[(0²*0.2)+(1²*0.4)+(2²*0.4)]-(1.2)²=[0+0.4+1.6]-1.44=0.56hence: standard deviation=sqrt(0.56)=0.74833

Answer
The correct answer was given: Brain
The answer would be A. 1 1/5

48/40 = 1 8/40

1 8/40 Simplify to 1 1/5

Hope this helps! 

Answer
The correct answer was given: Brain
I believe it is 60-10=x because it says she purchased it with 60$ but recieved 10$ in change causing the amount we dont know to be a variable such as “x”

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