Question

In a current-events class, a professor predicted that at least 78 percent of students prefer getting their news from a digital source rather than from a print source. He polled 3 classes.The results are shown in the table below.
In which classes(es) did his prediction hold true? Explain.

Answer 1

Answer: Class 1 and Class 3 shows the correct prediction that atleast 78% of students chose digital source.

Step-by-step explanation:

Since we have given that

There is a table showing number of students prefer getting their news from a digital source or a print source.

And we have mentioned that a professor predicted that at least 778 % of students prefer getting their news from digital source rather than from a print source.

From class 1, we get that

Number of students chose digital source = 20

Total number of students = 25

So, percentage of students prefer digital source is given by

$\dfrac{20}{25}\times 100=80\%$

Similarly, from class 2, we get that

Number of students chose digital source = 14

Total number of students = 24

So, percentage of students prefer digital source is given by

$\dfrac{14}{24}\times 100=58.33\%$

Similarly, From class 3, we get that

Number of students chose digital source = 30

Total number of students = 37

So, percentage of students prefer digital source is given by

$\dfrac{30}{37}\times 100=81.08\%$

Therefore, Class 1 and Class 3 shows the correct prediction that atleast 78% of students chose digital source.

Answer 2

80% for class one; 58% for class two; 81% for class three.Therefore, classes one and three did his prediction hold true.