If you are asked to present the $95\%$ confidence interval for Dell$$s next value in the series $($Q$4$ at the end of January $2021),$ it would be between $($after rounding$)...$

$$$23\mathrm{.}8$ billion and $$31\mathrm{.}2$ billion

$$25\mathrm{.}6$ billion and $$29\mathrm{.}3$ billion

$$12\mathrm{.}1$ billion and $$15\mathrm{.}8$ billion

$$10\mathrm{.}2$ billion and $$17\mathrm{.}6$ billion

$$23\mathrm{.}2$ billion and $$30\mathrm{.}6$ billion

$$25\mathrm{.}0$ billion and $$28\mathrm{.}8$ billion

Report Date Quarter Revenue in Millions

$05/01/20151$ $ $12,838$

$07/31/20152$ $ $12,975$

$10/28/20153$ $ $12,674$

$01/29/20164$ $ $12,679$

$04/29/20161$ $ $12,534$

$07/29/20162$ $ $13,050$

$10/28/20163$ $ $16,247$

$02/03/2017$ $ $20,074$

$05/05/2017$ $ $17,816$

$08/04/2017$ $ $19,299$

$11/03/2017$ $ $19,610$

$02/02/2018$ $ $21,935$

$05/04/2018$ $ $21,356$

$308/03/2018$ $ $22,942$

$11/02/2018$ $ $22,482$

$02/01/2019$ $ $23,841$

$05/03/2019$ $ $21,908$

$08/02/20192$ $ $23,370$

$11/01/20193$ $ $22,844$

$01/31/20204$ $ $24,032$

$05/01/20201$ $ $21,897$

$07/31/20202$ $ $22,733$

$10/30/20203$ $ $23,482$