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In a study of adult green sea urchins it was found that their weights are normally distributed with a mean of 52.0g and a standard

In a study of adult green sea urchins it was found that their weights are normally distributed with a mean of 52.0g and a standard deviation of 17.2g

a. find the percentage of adult green sea urchins that have weights between 50g and 60g

b. what percentage of adult green sea urchins have weights above 40g?

c. Determine and interpret the 90th percentile for the weights.

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