$($c$)$ Which is better $($using the mean absolute deviation$)$: the $2-$month average or the $3-$month average?Chapter $4,$ question $9,$ part c:

Lenovo uses the ZX$-81$ chip in some of its laptop computers. The prices for the chip during the past $12$ months were as follows:

MONTH PRICE PER CHIP MONTH PRICE PER CHIP

January $$1\mathrm{.}80$ July $1\mathrm{.}80$

February $1\mathrm{.}67$ August $1\mathrm{.}83$

March $1\mathrm{.}70$ September $1\mathrm{.}70$

April $1\mathrm{.}85$ October $1\mathrm{.}65$

May $1\mathrm{.}90$ November $1\mathrm{.}70$

June $1\mathrm{.}87$ December $1\mathrm{.}75$