Exam-Style Problem
⬅ Back to Subchapter
Browsing as Guest. Progress, bookmarks and attempts are disabled.
Log in to track your work.
Nov 2022 p52 q4
2410
The times taken, in minutes, to complete a word processing task by 250 employees at a particular company are summarised in the table.
| Time taken \( t \) (minutes) | \( 0 \le t \lt 20 \) | \( 20 \le t \lt 40 \) | \( 40 \le t \lt 50 \) | \( 50 \le t \lt 60 \) | \( 60 \le t \lt 100 \) |
|---|---|---|---|---|---|
| Frequency | 32 | 46 | 96 | 52 | 24 |
(a) Draw a histogram to represent this information.
From the data, the estimate of the mean time taken by these 250 employees is \( 43.2 \) minutes.
(b) Calculate an estimate for the standard deviation of these times.
Log in to record attempts.