According to the national sleep foundation, teenagers need about 9 hours of sleep each night to function at their best. unfortunately, many teens do not get nearly this amount. two samples of 100 teenagers were asked about the average number of hours they sleep each school night. the results are recorded in the table below.

< 4
4 - 6
6 - 8
8 - 10
10 +
sample #1
2
9
39
44
6
sample #2
1
12
34
48
5
based on the results in the table, in a high school that contains 925 students, approximately how many of the students would you expect to get between 8 and 10 hours of sleep each school night?
425
850
340
445

425 students

Step-by-step explanation:

1.- the number of students that sleep between 8 - 10 hours a day in one sample was 44 and in the other sample was 48.

2.- If you get the average among them (44 + 48 / 2) = 46 % of  students from a total sample of 100 students.

3.- If the total of your population is 925 students, that mean the 100 %, you need ro obtain the equivalent of the 46 %.

4.- Use a simple rule of three

5.- 925 students = 100 %

            X students = 46 %

6.- (925 x 46 %) / 100 % = 425 students

ok

step-by-step explanation:

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m