The probability that Sue completes a Sudoku puzzle correctly is 0.75.
a) Sue attempts $n$ Sudoku puzzles. Find the least value of $n$ for which the probability that she completes all $n$ puzzles correctly is less than 0.06.
Sue attempts 14 Sudoku puzzles every month. The number that she completes successfully is denoted by $X$.
b) Find the value of $X$ that has the highest probability. You may assume that this value is one of the two values closest to the mean of $X$.
c) Find the probability that in exactly 3 of the next 5 months Sue completes more than 11 Sudoku puzzles correctly.
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