Question

To find out approximately how many minutes students in a high school are spending texting while in class, the guidance counselor conducts a carefully designed and implemented random survey. The table below shows the number of minutes per week these randomly selected students text in class.

Minutes Per Week Students Text in Class

Student Minutes Per Week Texting
Zack 21
Zoe 35
Paige 77
Curtis 48
Jeremiah 24
Robyn 29
Hayden 37
Michelle 98
Ismail 30
Courtney 7


What is the estimated number of minutes per week all students in this school, the population mean, text while in class based on the sample, rounded to the nearest tenth of a minute?

A: μ ≈ 40.6 minutes/week
B: μ ≈ 39.5 minutes/week
C: μ ≈ 28.9 minutes/week
D: μ ≈ 41.9 minutes/week

Answer 1

Add all the minutes together, then divide by the number of students:

21+35+77+48+24+29+37+98+30+7 = 406 total minutes

10 students.

Average = 406 / 10 = 40.6 minutes per week.

The answer is A.