EM-2988
Mean
E Math · Secondary 4 · Medium · Mean
The table shows the times, in seconds, taken by 80 students to finish a puzzle.
Time t (s): 0 < t ≤ 10, 10 < t ≤ 20, 20 < t ≤ 30, 30 < t ≤ 40
Frequency: 6, 18, 32, 24
Calculate an estimate of the mean time taken.
Time t (s): 0 < t ≤ 10, 10 < t ≤ 20, 20 < t ≤ 30, 30 < t ≤ 40
Frequency: 6, 18, 32, 24
Calculate an estimate of the mean time taken.
- 24.3 s
- 19.4 s
- 25.0 s
- 21.0 s
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