It's the quadratic deviation from the mean.

let me be very careful.

Test are just the average squared error, or one half of the average squared error on my training validation and test sets without the extra regularization chart.

Again his average 22.7, standard deviation of 9.6, and variance of 92.

The variance by its very nature computes in the quadratic.

Now what happens when you change the standard deviation.

That is variance and another term for variance is mean squares because it is the mean of the sum squares.

And so, you know, the variance, I'm gonna estimate as just the average of the square differences, between my examples, minus the mean.

And again it is right there in the math, you should feel comfortable with this mathematically it's the deviation scores square them, sum square deviation scores, that's the sum squares, if you divide by n, that's the mean squares.

So that leads me to the final concept in this, in this segment and that's just variants and co variants.

And what is the squared distance from 0 to our mean?

If the probability distribution of x is Gaussian, it would mean Mu and variant sigma squared, then we'll write this as x the random variable tilde.

So what are the solutions? t is equal to negatives b.

Then we can sum the squared deviations scores and divide by n. So if we sum this column we get 922.1 divided by ten is 92.21.

Remember the notation, the sum of squares and mean squares.

What is the variance of this distribution?

And they unfortunatly know very little.

Average

So it's just e to the, this whole thing over here, minus x minus the mean squared over 2 sigma squared.

Mu is the mean, or the average.

Mean

Average Score

Average bitrate

By average

Average value

Mean Score

Average bitrate

Average bitrate

Average Bitrate

Mean

So, intuitively speaking, the formulas are really easy.

So this is basically the average squared error as measured on your test set.

On an average, I go to the movies twice a month.

Average

Average Rating

Average speed

Moving average

Mean velocity

Mean height

Mean height

And again, start to embrace this notation, this is gonna be very ah, common, and we'll use it a lot as we move forward through the course.

It's in the straight middle, because these two variances are the same, so we just average the means.

We know that the average after four exams, at four exams, is equal to 84.

The average American living space is twice as large as the living space in Japan.

But we already know how to put in the area, just one of them.