Joan asked 30 randomly selected adult restaurant customers about their choice of beverages. 18 customers said coffee is their favorite beverage. If the restaurant serves 200 adult customers per day, estimate the number who will choose coffee to drink.
A100
B110
C120
D130
You are surveying students to find out their opinion of the quality of food served in the school cafeteria. You decide to poll only those students who buy hot lunch on a particular day. Is your sample random? Please explain
If 18 customers out of 30 prefer coffee, we can find the ratio that will be used to estimate how many customers out of 200 will prefer coffee. We can do this by dividing 18 by 30 to give us 0.6. Then, we multiply 200 by 0.6 to give us 120. Therefore, the answer is 120.
6. No, your sample is not random, as you are only asking how the food is for students that only buy hot lunches. If it was random, you'd be asking any student how the food is, not just specifically one group of people.
