Question

At a larger grocery store, some food is sold under the brands A, B and C.
Historically, sales account for 60% of brand A, 30% of brand B and
10% of brand C. Recently, a sample survey was conducted where 200 customers had to answer
on a survey, and of these customers bought 110 brand A, 55 brand B and 35 brand
C. The investigation provides evidence that the percentages for the three brands can
different from the historical proportions? Perform an appropriate test to answer
The question. Also specify the conditions you need to check in your test.

Answer 1