I am so confused. An explanation would be very helpful!

14-15. A random sample of size n = 1000 is taken from an infinite population with the mean u = 30 and the variance o2 = 361. 14. Based on Chebyshev's theorem, with what probability can we assert that the value we obtain for X will fall between 27 and 33? 15. Based on the central limit theorem, with what probability can we assert that the value we obtain for X will fall between 27 and 33