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The mean and variance of a data set comprising 15 observations are 15 and 5 respectively. If one of the observation 15 is deleted and two new observations 6 and 8 are added to the data, then the new variance of resulting data is

S' Limited is manufacturing steel at its plant in India. It's enjoying a buoyant demand for its product as economic growth is about 7 to 8% and the demand for steel is growing. It is planting to set up a new steel plant to cash on the increased demand it is facing. It is estimated that it will require about Rs. 5,000 crores to set up and about Rs. 500 crores working capital to start the new plant.