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July 31, 2015

Homework Help: Stats

Posted by CM on Sunday, September 27, 2009 at 8:51pm.

Suppose that you find out that 20% of all babies say their first word by the time they are 13 months old, and that 90% of all babies say their first word by the time they are 22 months old. Assume that the age at which a baby says its first word is normally distributed. Find the mean age at which a baby says its first word, and the standard deviation.

I don't know how to standardize this without either one (the mean or standard deviation) if that is even what I have to do?

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