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THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING

Question 235

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THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING:
From past experience,it is known 90% of one-year-old children can distinguish their mother's voice from the voice of a similar sounding female.A random sample of 20 one-year-olds is given this voice recognition test.
-Find the probability at least 3 children do not recognize their mother's voice.

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P(X ≥ 3)= ...

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