Answer:
a) 885 students
b) 18 students
Step-by-step explanation:
a) We know that 24 of the students were surveyed and 17 of them said they always wear a bike helmet.
So out of 1250 students, the estimated number of students who always wear a bike helmet will be = [tex]\frac{17}{24}[/tex] × [tex]1250[/tex] = 885.4
Therefore, approximately 885 students always wear a bike helmet.
b) We know the ratio of students who always wear a bike helmet i.e. [tex]\frac{17}{24}[/tex].
So if 13 of the students surveyed said they always wear helmets, we can find the total number of students surveyed this time by assuming it to be n.
[tex]\frac{17}{24}[/tex] × [tex]n = 13[/tex]
[tex]n = \frac{13*24}{17}[/tex]
[tex]n = 18.35[/tex] ≈ [tex]18[/tex]
Therefore, 18 students were surveyed the second time.
