# in class problems june 20 getting ready for quiz

# 3 part (a) I put... 1(.1)+2(.2)+4(.4)+7(.3) for the mean, thus mean = 4.2

part (b) are we using σ^2(X)=∑(xi−μ)^2pi.? If so, would it be...

(1-4.2)^2x(.1) + (2-4.2)^2x(.2) +...

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part (b) are we using σ^2(X)=∑(xi−μ)^2pi.? If so, would it be...

(1-4.2)^2x(.1) + (2-4.2)^2x(.2) +...