New$-$car sales of a dealer during the past year are shown in the following table, along with monthly seasonal relatives.

Month Units Sold Seasonal

Relative

Jan $7000\mathrm{.}75$

Feb $6380\mathrm{.}75$

Mar $6340\mathrm{.}65$

Apr $7700\mathrm{.}86$

May $7410\mathrm{.}80$

Jun $8540\mathrm{.}95$

Jul $7730\mathrm{.}85$

Aug $8201\mathrm{.}08$

Sept $8691\mathrm{.}14$

Oct $8431\mathrm{.}14$

Nov $8751\mathrm{.}16$

Dec $8511\mathrm{.}16$

a$-1.$ Select the correct chart showing the plotted data.

Chart A Chart B Chart C

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a$-2.$ Does there seem to be a trend?

b$.$ Deseasonalize the new car sales. $($Round the final answers to $1$ decimal place.$)$

Month De$-$seasonal

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

c$.$ Select the correct chart showing the deseasonalized data on the same graph as the original data.

Chart A Chart B Chart C

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