pple's decision to quit Intel and use its own M$1$ chip to power the latest MacBook Pro, MacBook Air, and Mac Mini will save the company $$2\mathrm{.}5$ billion, according to a new report.

The prices for this chip from a year long prototype production are

Month

Price per chip $($$$)$

Jan

$286\mathrm{.}14$

Feb

$242\mathrm{.}47$

Mar

$240\mathrm{.}96$

Apr

$278\mathrm{.}61$

May

$286\mathrm{.}14$

Jun

$293\mathrm{.}67$

Jul

$271\mathrm{.}08$

Aug

$263\mathrm{.}55$

Sep

$256\mathrm{.}02$

Oct

$225\mathrm{.}90$

Nov

$225\mathrm{.}90$

Dec

$263\mathrm{.}55$

Using a $2-$month moving average, the forecast for October, November and December would be

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Using a $3-$month moving average, the forecast for October, November and December would be

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The MAD $($Mean Absolute Deviation$)$ for $2-$month moving average of March through December is

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The MAD $($Mean Absolute Deviation$)$ for $3-$month moving average of April through December is