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The basal diameter of a sea anemone is an indicator of its age. Suppose Y is...

The basal diameter of a sea anemone is an indicator of its age. Suppose Y is approximately normally distributed with population mean diameter is 2.2 cm and the standard deviation is 1.3 cm. Let Y-bar represent the mean diameter of 25 anemones randomly chosen from the population

Find the following probability: Pr{Y-bar < 7.8}.

Round to three decimal places.

This is a homework question I am struggling with. I can't figure out the formula to use for Ybar, if anyone can help it would be great to see a step by step.

math   Statistics-And-Probability   
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hii..if you have any doubt please ask by comment. please like the answer. thanks..

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