a) Work out an estimate for the mean number of years of service. (4 marks) b)...

  

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a) Work out an estimate for the mean number of years of service. (4 marks) b) What is the standard deviation for the mean number of years of service? (6 marks) Years of service No. of People (f) Midpoint(x) fx (f multiplied by x)|x²|fx² 0 to 5 10 5 to 10 30 10 to 20 40 20 to 30 50 30 to 40 20 la a) Work out an estimate for the mean number of years of service. (4 marks) b) What is the standard deviation for the mean number of years of service? (6 marks) Years of service No. of People (f) Midpoint(x) fx (f multiplied by x)|x²|fx² 0 to 5 10 5 to 10 30 10 to 20 40 20 to 30 50 30 to 40 20 la