distribution of x is N(mu,4) n=10:

55.95

56.54

57.58

55.13

57.48

56.06

59.93

58.30

52.57

58.46

point estimate?

endpoints for 95% confidence interval for mu?

probability when one is selected at random that it is less than 52?

i'm lost and would loooove some help..... thankyou