The lengths of one-year-old baby girls can be described using a normal distribution with a mean of 29 inches and a standard deviation of 1.2 inches. using the 68-95-99.7 rule, what percent of one-year-old girls are smaller than 27.8 inches?

The '68-95-99.7 ' rule says,

-About 68% of values fall within one standard deviation of the mean.

-About 95% of the values fall within two standard deviations from the mean.

-Almost all of the values — about 99.7% — fall within three standard deviations from the mean.

Here

The length falls within one standard deviation of the mean.

Therefore, the probability

The required probability is

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step-by-step explanation:

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answer: for each 3 girls there is 2 boys . 3: 2

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