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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Average

In mathematics, everyone must have heard the term average in one place or other. Almost all types of calculation require taking out an average. In everyday life, the term is used for denoting a certain amount that can be said to be a typical quantity for multiple people or objects. In other words, if a group of people possesses a certain object, then the average gives us an idea regarding the quantity of the object possessed by each person. However, this is solely based on mathematical calculation. It is important to note that most people will not strictly have the average value in a group.