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2 September, 05:39

From past experience, it is known that 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-old children are given this voice recognition test. calculate the variance.

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  1. 2 September, 05:52
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    1/20 all of 20 kids can know there mother name
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