Put some air in your tires: Let X represent the number of tires with low air pressure on a randomly chosen car. The probability
distribution of X is as follows. x 0 1 2 3 4
Px 0.2 0.1 0.4 0.2 0.1
Compute the standard deviation σX. Round the answer to at least three decimal places.
In my opinion there are an infinite amount of answers though what i got when i solver wasn’t right i would think you just have to try and solve on your own.
