00:01
Hello, friends, we are going to write a tipping percent for 20 restaurant tables, so data is given.
00:06
So we are going to write here a part and b part.
00:09
So we are going to write here in the first case.
00:14
We are writing here mean.
00:17
Mean must be sum of data divided by number of data.
00:26
This must be number of data.
00:30
So if i write here for this, sum of the data would be 8 plus 13 and this must be dot, dot, divided by 23.
00:43
So we are going to write here number of data must be 20.
00:49
So this value will come out as if i write here for this, this value must be 706 .3 divided by 20.
01:00
That is equivalent to 35 .3150 up to four decimal places mean value.
01:06
Now we are going to write here what would be our standard deviation value.
01:12
So this must be standard deviation.
01:17
We are going to write here for this.
01:21
Standard deviation this must be if i write here for this under root of 1 upon and minus 1 there must be multiplied by summation of x i is equal to 1 to n we are going to write here minus 1 upon n summation of x i is equal to 1 to n and raise to power 2 so if i write here this value must be under root of 1 upon n minus 1 so total n value must be if i write here for this so here this must be so n value is 20 so 1 divided by 19 multiplied by summation of x i square submission of x i square so we are going to write here this must be 8 square 8 square we are going to write here for this this must be 8 square 30 square up to 23 square we are going to write here for this up to 23 square minus 1 upon 20 and this must be we are going to write here for this 8 plus 13 dot dot up to 23 and we are writing here whole square we are writing here whole square for this so this must be curly bracket in both the cases and this must be large bracket so let's write here here this must be our curly bracket and this is large bracket same here same here this must be our curly bracket and this whole must be in the so this must be whole in this particular bracket let's say this is our bigger bracket now we are going to write here for this this is calculated as under root of 1 .20 minus 1 which is 19 so 1 upon 19 and this is 35733 .21 35733 .23 .2 .21 minus 706.
03:45
0 .3 .3, raise to power 2 divided by 20.
03:49
We are going to write it divided by 20.
03:52
So this value must be under root of 567 .907.
03:58
So we are going to write here 23 .831.
04:03
So if i write here for this, hence mean an standard deviation would be, mean value is 35 .3150...