Word problem based on Empirical Rule, Any help would greatly be appreciated

First quartile = 44 Third quartile = 68 Standard deviation = 9 Range = 55

Mean = 51 Median = 54 Mode = 71 Midrange = 64

Answer each of the following:

I. What score was earned by more students than any other score? Why?

II. What was the highest score earned on the exam?

III. What was the lowest score earned on the exam?

IV. According to Chebyshev's Theorem, how many students scored between 57 and 93?

V. Assume that the distribution is normal. Based on the Empirical Rule, how many students scored between 57 and 93?

How do I start on this? I understand the mean, median, an so forth.