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# Calculation of probability based on normal distribution

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The number of shark attacks per year in the US is distributed approximately normal, with a Variance of 31.8 and a standard deviation of 10.

A) Determine the number of shark attacks per year that separate the top 2% from the bottom 98 %

B) Determine the number of shark attacks per year that constitute the middle 80% of shark attacks per year.

https://brainmass.com/statistics/probability/calculation-probability-based-normal-distribution-353155

#### Solution Preview

Probability problem...
The number of shark attacks per year in the US is distributed approximately normal, with a Variance Mean of 31.8 and a standard deviation of 10.

A) Determine the number of shark attacks per year that seperate the ...

#### Solution Summary

This solution gives the step by step method for computing probabilities based on Z score.

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