Sum of the items in set of data Mean =
number of items in set of data
Range = Biggest data value - smallest data value.
The marks for 10 learners in the gr. 9 Mathematics test were as follow:
45
36 81 20 77 18 54 48 51 36
3.1
Arrange the marks in ascending order
3.2
Calculate the mean mark (percentage) for the 10 learners correct to one decimal.
3.3 Determine the range of marks
3.4
Determine the mode.
3.5 The mean of the following 3 marks is 20
24 A 21
Determine the value of A​