Chemistry Problem, can anyone help?

Question

According to the official rules of baseball, a baseball must have a circumference not more than 9.25 in. or less than 9.00 in. and a mass no more than 5.25 oz and no less than 5.00 oz. What range of densities can a baseball be expected to have? Express this range as a single # w/ an accompanying uncertainty limit.

Answer 1

the most dense would have  9.00  inch  circumference & a mass of 5.25 oz.

9.00 inch  circumference gives :

radius of   1.4324 inches, which gives :

a volume of   12.311 cubic inches

which gives a density of:

5.25 oz / 12.311 cu in = 0.426 oz. / cu in

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the least dense would have  9.25  inch  circumference & a mass of 5.00 oz.

9.25 inch  circumference gives :

radius of    1.4722 inches, which gives :

a volume of  13.365 cubic inches

which gives a density of:

5.00 oz /  13.365 cu in = 0.374 oz. / cu in

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0.374  to 0.426 oz. / cu in averages 0.400  with a spread of 0.052

your answer is 0.400 oz / cu in +/- 0.026