A hardare store reviews sales receipts to see if certain types of items are boug

Question

A hardare store reviews sales receipts to see if certain types of items are bought together. The study may affect the floor plan used to display merchandise. For this question, label purchase type A includes cleaning supplies, and label it type B if it includes lighting equipment. Suppose that, out of 777 receipts, 556 purchases were type A, 432 purchases were type B and 344 were of both types A and B (A) How many type A purchases were not of type B? (B) How many type B purchases were not of type A? (C) How many purchases were either of type A, or of type B (or of both types)? (E) What, to nearest is the percent, is the relative frequency purchases that were of neither type?

Explanation / Answer

Answer:

A).   556-344 =212

B). 432-344=88

C). 556+432-344 =644

D). 432/777 =0.556 or 56%

E). neither type =777-644=133

133/777 =0.1712 or 17%

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