An office of Fine Tune Telecommunications hired seven trainee engineers this year. Their monthly starting salaries were: $5356; $5651; $5423; $5534; $5467; $5289 and $5670. (a) Compute the population mean. (b) Compute the population variance. (c) Compute the population standard deviation. (d) Another location hired eight trainee engineers. Their mean monthly salary was $5650, and the standard deviation was $480. Compare the two groups