$1-$ Given the following demand, forecast the demand for period $7$ by:

a$-$ Na$$ve method

b$-$ Arithmetic Average

c$-$ Moving Average where $n=3$

d$-$ Weighted moving Average where $n=3$ and weights are: $7,2,1$

e$-$ Which method is more accurate based on MAD

$\backslash$table$[[$Period$,$Demand$],[$January$,50],[$February$,70],[$March$,60],[$April$,50],[$May$,70],[$June$,60],[$July$,?$