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7 From past experience it is known 90 of 1 year old children can distinguish...

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7 From past experience it is known 90 of 1 year old children can distinguish their mother s voice from the voice of a similar sounding female A random sample of 20 1 year olds is given this voice recognition test 12 points HINT This is a binomial distribution n p q HINT 2 The value of p will change depending on the children recognizing or the children not recognizing the voice A Find the probability at least 3 children do not recognize their mother s voice B Find the probability all 20 children recognize their mother s voice I C Find the mean and standard deviation of x where x is the random variable denoting the number of children who recognize their mother s voice D Find the probability that at most 4 children recognize their mother s voice

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