Write an explicit and recursive formula for the sequence -4, -6, -8, 10

Each term is 2 greater than the term before it. Thus for any given term, an, our equation is:

an=2n

We can write this in a form closer to standard, by noting that a1=2, so we can make it dependent on a1..

an=a1+2(n−1)=2+2(n−1)

an advantage of the standard deviation is that it increases as the dispersion of the data increases. e. the interquartile range is preferred when the data are not skewed or no have outliers. an advantage of the standard deviation is that it uses all the observations in its computation.