Turn-around time of a job is defined as the difference between its completion and arrival times. Individual turn-around times of the Sun & Fun Manufacturing Company can be assumed to be normally distributed. Drawn from an infinite population, in a random sample of n=100 jobs, the sample mean was found to be 5 days and the unbiased sample standard deviation was found to be 2 days. Based on these information,the 95% confidenceinterval for the unknownpopulation mean is between

a.1.080 and 8.920

b.4.608 and 5.392

c.3.040 and 6.960

d.Not enough information given to answer this question