Learning about a percentile

Suppose you want to learn about the 75th percentile of the sampling distribution defined by: $$Q75 = M + 0.674 S$$

100 XP

Examine the code that simulates 1000 values from the posterior distribution of (M, S).
Use the coef() and sigma.hat() functions to extract simulated vectors of M and S from sim_fit.
Compute simulated posterior values of the 75th percentile and save the result as Q75.
Construct a histogram of the posterior of Q75.
Find a 70% probability interval for Q75.