452.26 to the nearest cubic inch?

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .

With finding limits of multi variable !