Moving means. 3-mean smoothing. The first and last y-value are omitted For all others, the y-values are replaced with the average of itself, the value above and the value below. 5-mean smoothing. The first two and last two y-values are omitted
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d) Cannot be calculated (this term is omitted)
First we leave spaces between each row of data. In each of these spaces we average the y-value above and the y-value below
Now we must centre our data. Each month should have a value above it and a value below it (except Jan and Jul, which are omitted)