00:01
A grocery store clerk was asked to provide the standard deviation for a sample bag of apples, and they found that the standard deviation, s, sample standard deviation, was 5 .3.
00:12
Then they realised their scale is off by 0 .8 pounds.
00:15
Every value should be 0 .8 pounds more than originally reported.
00:21
What is the new standard deviation? so let's look at the formula for standard deviation.
00:25
Deviation.
00:26
You take each value, you subtract the mean, x bar, square of difference, add them all up, divide by n minus 1, and then you square root this.
00:37
Notice it's n minus 1, that's because it's a sample standard deviation.
00:41
If it were a population it would just be n, but that won't matter here.
00:45
So what's going to happen if i take every value of x and i add 0 .8 to every value? well first let's look at what happens if a sample mean.
00:55
So the the sample mean is found by taking each value, adding them up, and dividing by the total...