TUTORIAL 2
Section A
The frequency distribution below summarises the length of time (minutes) spent on the
internet by a sample of 50 ADSL subscribers during their most recent session.
Time (𝑋)
Frequency
6.5 ≤ 𝑥 < 18.5
6
18.5 ≤ 𝑥 < 30.5
10
30.5 ≤ 𝑥 < 42.5
13
42. 5 ≤ 𝑥 < 54.5
8
54.5 ≤ 𝑥 < 66.5
5
66.5 ≤ 𝑥 < 78.5
6
78.5 ≤ 𝑥 < 90.5
2
Use stats mode on your calculator to answer the following 2 questions:
Question 1
What is the approximate average length of time (minutes) spent on the internet by these
ADSL subscribers?
Question 2
What is the approximate standard deviation and variance of the length of time spent on the
internet by these ADSL subscribers?
Section B
Complete the exercises in the interactive Excel workbook “Tutorial 2 – Decimal data”. This
workbook can be found in the Tutorial Questions folder on Moodle/Learn2021. The yellow
cells will turn green if the answers you type in them are correct. The exercises will also be
included in the Tutorial 2 quiz (you do not need to submit the Excel workbook).
Additional unseen Excel questions may be included in the Tutorial 2 quiz.