AnswersCR02201A Probability and StatisticsMultiple SamplesQuestion 5
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Multiple Samples

Question 5 • CR02201A Probability and Statistics

A restaurant serves three types of omelettes. Surveys were taken of the last two days of orders and are displayed in the table below. Approximately 200 omelettes are served each day. What is the average number of ham and cheese omelettes served each day?Omelette SurveySample 1Sample 2Ham and Cheese7Ham and Cheese11Mexican 4Mexican2Vegetarian1Vegetarian5

Answer
A
93
B
120
C
127
D
147

Explanation

In Sample 1, 7 of 12 omelettes were ham and cheese, so the estimated number for that day is about (7 ÷ 12) × 200 = 117. In Sample 2, 11 of 18 were ham and cheese, giving about (11 ÷ 18) × 200 = 122. The average is about (117 + 122) ÷ 2 = 120, so the answer is 120.

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