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20f9 n1 iidity level of the electronic devices may either increase the conductivity of r--..--..ole insulators leading to malfunction or make the materials brittle. Table Q1 shows the humidity readings in percentage. (51) (b) Table I 1 21-30 31-40 41-50 Calculate the following values. (i) sample mean (3 marks) (ii) median (4 marks) (iii) standard deviation. (3 marks) (iv) the minimum humidity reading of the top 20% readings. (4 marks) The continuous data are grouped in three classes as 0-4, 4-12 and 12-20. The frequency densities of the classes 0-4 and 12-20 are in the ratio 5:2 and the total frequency of these two classes is 144. Calculate the least possible frequency of the modal class, given that the modal class is 4-10. (6 marks)