a$.$ Discuss the presence of random variations.

multiple choice

The smoother appearance of the graph suggests the presence of random variations.

The smoother appearance of the graph suggests the absence of random variations.

The jagged appearance of the graph suggests the presence of random variations.

The jagged appearance of the graph suggests the absence of random variations.

b$-1.$ Use the exponential smoothing method to make forecasts with $\backslash$alpha $=0\mathrm{.}2.($Do not round intermediate calculations and round final answers to $2$ decimal places.$)$