00:01
So in this problem, we suppose that a random sample size of 20 is taken from a normal distribution with an unknown mean and a known variance equal to 1, and the mean is found to be x bar is equal to 10.
00:12
And a normal distribution was used as the prior for the mean, and it was found that the posterior mean was 15, and the posterior standard deviation was 0 .1.
00:20
And so we're asked what were the mean and standard deviation of the prior.
00:25
And so we know that we're given that x1 is 20.
00:36
So we're given that they're independent, identically distributed random variables.
00:42
So we have x bar equal to 10.
00:44
And the prior distribution of the mean is normal, and that the posterior mean is 15, and the posterior standard deviation is 0 .1.
01:05
And so we need to find the prior mean and the prior standard deviation.
01:16
And so we have these two relations...