robert7248
12.10.2020 •
Mathematics
Which of the following statements is true about the sum of a rational and an irrational number?
A.
The sum of a rational and irrational number is always a rational number.
B.
The sum of a rational and irrational number is never an irrational number.
C.
The sum of a rational and irrational number is sometimes a rational number.
D.
The sum of a rational and irrational number is always an irrational number.
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Ответ:
Ответ:
C)He should also take a sample from each of the other history classes in all of the other grades in the middle school.
Step-by-step explanation:
Not only students in the 8th grade are in the middle school, there are other students in other grades who are in the middle school and are enrolled in history classes. Leo's sample is only from one grade of the middle school. In fact, including Ms. Lopez's and Mrs. Frank's classes in the selection of sample is not sufficient. Leo has to take a sample from the remaining grades to avoid making a wrong conclusion as a result of bias in the choice of data.