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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A: (1)11,10,8,4,6,7,11,6,11,7(2)15,8,12,5,19,14,8,6,13

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Q: , median, mode and standard deviation for this data set.

A: 3,7,8,6,6,9,10,5,1,10,8,5,5,7Mean = [sum of the terms] / [number of the terms]Mode = Median = middle…

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Q: How to find standar deviation and an example

A: The formula for standard deviation can be defined as:

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A: The mean can be calculated as follows:

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Q: Life Time: 11-15 19-23 3-7 15-19 23-27 Number of Batteries: 20 10 10 4. Find the median of the data.

A: p

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