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A typist at a constant speed of 95 words per minute makes a mistake in any particular word with probability 0.04, independently from word to
A typist at a constant speed of 95 words per minute makes a mistake in any particular word with probability 0.04, independently from word to word. Each incorrect word must be corrected, a task which takes 13 seconds per word. Find the variance of the time (1 decimal accuracy) it takes to finish a 400-word passage
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