# Calculation of probability based on normal distribution

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.

© BrainMass Inc. brainmass.com May 20, 2020, 7:42 pm ad1c9bdddfhttps://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.

$2.19