Jane surveys a random sample of 200 students from her middle school to learn what type of school lunch is preferred. The table below shows the result of the survey:

Lunch Type

Sandwich

Hot Dog

Salad

Number of students
84 85 31

Which of the following inferences can be made based on the data?
A sandwich is the most preferred lunch. A sandwich is two times more popular than a salad. Sandwiches and hot dogs are almost equally preferred. A hot dog is almost two times more popular than a salad.

Question

Jane surveys a random sample of 200 students from her middle school to learn what type of school lunch is preferred. The table below shows the result of the survey:




Lunch Type

Sandwich

Hot Dog

Salad



Number of students
84 85 31 


Which of the following inferences can be made based on the data?
 A sandwich is the most preferred lunch. A sandwich is two times more popular than a salad.  Sandwiches and hot dogs are almost equally preferred. A hot dog is almost two times more popular than a salad.

michele_laino · Answer

total number of student:
84+85+31=...

michele_laino · Answer

please complete my computation

anonymous · Answer

It is 200 right.

michele_laino · Answer

ok! right!
probability for sandwich is:
84/200=...

anonymous · Answer

0.42

michele_laino · Answer

yes! or equivalently 42%

michele_laino · Answer

next:
probability for hot dog, is:
85/200=...

michele_laino · Answer

the probability is given by the subsequent ratio r:
r= favorable outcome/possible outcome
now we can consider our probabilities as experimental frequencies

michele_laino · Answer

$$\Large  \frac{{85}}{{200}} = ...?$$

michele_laino · Answer

next:
probability for salad, or experimental frequency for salad is:
$$\Large  \frac{{31}}{{200}} = ...?$$
please complete my computation