Plzz answer ques 53

Plzz answer ques 53 10 15 20 20 {Mean = 12 4: Standard devta'i00 5 C V 47 53. The following table shows the marks obtained by 60 students, Calculate mean and standard deviation. Marks (more than) No. of students Hint: First, convert the given series as ordinary continuous series and then use the step deviation method, (Mean 51 67 marks: Standard deviat'on=: 1513 54. Calculate standard deviation and coefficient of dispersion from the data below: Mid-Points 15 10 10 Hint: For coefficient of dispersion, calculate coefficient of variation as it is a better measure in corrpæso to coefficient of standard deaaux {Standard 18.49. C V z '1

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