z-scores (pt. 2)

pnorm_vis

Use the haffutils::pnorm_vis function in conjunction with pnorm for the following problems:

## load package here

## what percentage of the data lies left of a z-score of 1.35?

## what percentage of the data lies between a z-score of -1.9 and 2.1?

z-score/probability practice

## what percentage of the data lies right of a z-score of 0.53?

## what percentage of the data lies left of a z-score of -1.88?

## what percentage of the data lies left of a z-score of 2.25?

## what percentage of the data lies between a z-score of -1.88 and 2.25?

## what percentage of the data lies between a z-score of 1.7 and 2.7?

## 75% of the data in a normal distribution lies to the right of what z-score?

## 52% of the data in a normal distribution lies right of what z-score?

## 17% of the data in a normal distribution lies left of what z-score?

## 30% of the data in a normal distribtuion lies between which two z-scores? Assume an equal number above/below the mean.

z-score/probability word problems

## the occurence of tornadoes by year in a certain state is normally distribted
## with a mean of 14 and a standard deviation of 3.1. What is the probability of
## seeing more than 16 tornadoes in a given year?

## the occurence of flash floods by year in a certain state is normally
## distribted with a mean of 31 and a standard deviation of 5.5. What is the
## probability of seeing fewer than 20 flash floods in a given year?

## the occurence of forest fires by year in a certain country is normally
## distribted with a mean of 103 and a standard deviation of 17. What is the
## probability of seeing between 68 and 137 forest fires in a given year?