Hello. I have a tibble with unique pairs of parameters - in this case mean and standard deviation for a normal distribution. I would like to overlay the resultant normal curves for all the pairs on a single plot. For a single curve, I would do something like follows:

```
library(tidyverse)
param_tbl <- tibble(mean = c(5, 4, 6, 4, 3, 5, 6, 7),
sd = c(1, 2, 3, 2, 1, 3, 2, 2))
#data for a single curve with one pair of parameters
b <- tibble(x = seq(-5, 25, length.out = 100),
y = dnorm(x, 5, 1))
#plot for single curve
b %>% ggplot(aes(x = x, y = y)) +
geom_line()
```

How can I extend to plot all pairs?