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Spelling errors. Spell-checking software catches "nonword errors" that result in a string of letters that is not a word, as when "the" is typed as "teh." When undergraduates are asked to type a 250-word essay (without spell-checking), the number X of nonword errors has the following distribution: Value of X O 2 3 4 Probability 0.1 0.2 0.3 0.3 0.1 (a) Is the random variable X discrete or continuous? Why? (b) Write the event "at least one nonword error" in terms of X. What is th probability of this event? (c) Describe the event X