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Questions about probability theory, exam in 1 week.

Hi, i've got several questions about probability theory

1: how do you calculate odd's for a repeated uniform distribution. For example a dice is rolled 900 times and the eyes of the dice are counted, What is P(2900<X<3400).

2: How can i use the inequality of chebyshev to calculate odds when a distribution is not given. Example: average score of student on exam is 60/100. What's the upper boundary for the odd that a student will score above 80/100.

3: I don't really understand the lognormal distribution. example: lognormal distribution of X with µ= 1.9 and ? = 0.9. What are the odd's of x being between 5 and 10 at a certain moment.

English isn't my main language sorry for any mistakes.

thanks