It is estimated that only about 10% of 3-year olds already know how to write their (first) name. Out of 85 random sampled 3-year olds, 11 are able to write their name. What is the z-score associated with the observed sample proportion of 3-year olds already know how to write their name?

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The Answer of It is estimated that only about 10% of 3-year olds already know how to write their (first) name. Out of 85 random sampled 3-year olds, 11 are able to write their name. What is the z-score associated with the observed sample proportion of 3-year olds already know how to write their name?

It Is Estimated That Only About 10% of 3-Year Olds