Frequency distribution of marks obtained by 90 students is given below. Compute: (a) Arithmetic mean, (h) Mode, (c) Standard Deviation and (d) Coefficient of Skewness. No. of students . Marks No. of students Marks 20-30 5 60-70 18 30 40 12 70-80 10 40-50 15 80-90 50-60 20 90 and above 4

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