6 The time taken by employees to complete an operation was recorded on 80 occasions: Time (min) 10-0 10-5 11.0 11-5 12-0| 12-5 13-0 Frequency f 4 8 14 22 19 10 3 (a) Determine (i) the mean, (ii) the standard deviation, (ii) the mode and (iv) the median of the set of observations. (b) State (i) the class interval, (ii) the lower boundary of the third class, (iii) the upper boundary of the seventh class.

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6 The time taken by employees to complete an operation was recorded on
80 occasions:
Time (min)
11-0
11-5 | 12-0| 12-5
10-0
10-5
13-0
Frequency f
4
8
14
22
19
10
3
(a) Determine (i) the mean, (ii) the standard deviation, (iii) the mode and
(iv) the median of the set of observations.
(b) State (i) the class interval, (ii) the lower boundary of the third class,
(iii) the upper boundary of the seventh class.
Transcribed Image Text:6 The time taken by employees to complete an operation was recorded on 80 occasions: Time (min) 11-0 11-5 | 12-0| 12-5 10-0 10-5 13-0 Frequency f 4 8 14 22 19 10 3 (a) Determine (i) the mean, (ii) the standard deviation, (iii) the mode and (iv) the median of the set of observations. (b) State (i) the class interval, (ii) the lower boundary of the third class, (iii) the upper boundary of the seventh class.
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