answer all the quetions

b) The Chief Operation Officer has approached the data analytics team in the company for improving the efficiency in repairing the equipment fault at the factory. The data given are recorded by the maintenance manager on the time taken by maintenance staff to repair a particular type of equipment fault. The following table shows the time taken in minutes to repair 250 recent faults. Table Q1(b): Time taken for maintenance works i. Calculate the mean and standard deviation of the time taken. ii. Calculate the coefficient of variation. (4 marks) iii. Explain the term measure of dispersion. (2 marks) ( 2 marks) iv. Discuss the advantages and disadvantages of using standard deviation