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4) A typical typists accuracy is 1450 words in 15000 words. What is the probability that this typist makes 4 errors in 550 w
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sol de 1450 p= 0.0 9 7 ll 15000 words. Prob. makes 4 essors in noe P(x=4) ne* p²* (1-P)- 550-4 4* (1-0.097) 550 - Cu *0.0979

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