qnorm function

This function returns the value of the inverse cumulative density function (cdf) of the normal distribution given a certain random variable p, a population mean μ, and the population standard deviation σ.

Syntax: qnorm(p, mean = 0, sd = 0, lower.tail = TRUE)

Parameters:

•  p: It represents the significance level to be used
• mean: vector of means.
• sd: vector standard deviation.
•  lower.tail = TRUE: Then the probability to the left of p in the normal distribution is returned. 

Example:

In this example, we are calculating the Z-score of the 95th quantile of the standard normal distribution using the qnorm() function in R.

Output:

[1] 1.644854

In this article, we will be looking at a guide to the dnorm, pnorm, qnorm, and rnorm methods of the normal distribution in the R programming language.