Connecting Averages Vihaan

Part one fill in the mean

 the mathematical definition of the mean is the average so we need to add all data points and divide by the amount of data points. Data  points are x,y,b,j we do (x+y+b+j)/4. (Green part)

Part 2  fill one non-mean data points 

We can multiply the # of data points by the mean and subtract the not mean known data points. Data points are unknown, g,h,j,k,l .mean is o ,we do 6o-g-h-j-k-l.

Part one formula we take sum of data points :Σ divide by the # of data points: n so Σ/n

Part 2 formula we take mean  number of data points - all data points:Σ-z z is unknown data point. (M*(n-1))-(Σ-z)  n-1 is data points - mean.