Given the following data:

$\backslash$table$[[$Period$,\backslash$table$[[$Number of$],[$Complaints$]]],[1,60],[2,65],[3,55],[4,58],[5,64]]$

Prepare a forecast for period $6$ using each of these approaches:

a$.$ Naive approach.

b$.$ A three$-$period moving average.

c$.$ A weighted average using weights of $\mathrm{.}50($most recent$),\mathrm{.}30,$ and $.20.$

d$.$ Exponential smoothing with a smoothing constant of $\mathrm{.}40$ and forecast of period $2=60.$