1. Calculate the mean deviation of the data set representing the lengths of names for a class of pupils.

2. In Practice Question 9.2 of Refresher Unit 9, data was presented on the percentage marks scored by 66 candidates in an examination. This data is reproduced in Table 10.14.

Calculate the mean deviation of this data using

(a) The raw ungrouped data

(b) The grouped data obtained in Practice Question 9.2.

Data from Practice Question 9.2

The data given in Table 9.8 represents the percentage marks scored by 66 candidates in an examination.

Transcribed Image Text:

77 59 84 73 51 43 50 81 61 53 69 37 58 63 67 61 90 61 50 60 84 56 77 57 42 43 41 49 37 21 24 35 34 50 11 52 30 16 33 67 87 64 27 59 37 92 88 30 38 22 22 49 46 50 64 33 73 73 48 26 36 57 85 71 57 45 Table 10.14 Percentage marks in an examination