A shopkeeper wants to find out the number of sandwiches sold in his shop. Which of the following is the most suitable method? Choose the best option.
a) Observe the selling of the sandwiches in his shop.
b) Interview customers randomly in his shop.
c) Carry out experiments on the sandwiches.
d) Give questionnaires to the customers to collect opinions.
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Answer:
a)Observe the selling of the sandwiches in his shop.
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