Among a Sample of 61 Students Selected at Random from a University,the

Among a sample of 61 students selected at random from a university,the mean number of siblings is 1.5 with a standard deviation of 0.9.Find a 95% confidence interval for the mean number of siblings for all students at this university.

A) (1.39,1.53)
B) (1.47,1.53)
C) (68.53,71.47)
D) (1.39,1.61)
E) (1.27,1.73)