00:01
Hello students, we are going to write here the mean score on a math is 14 .5 and 83 .8 % of the students score between these values.
00:12
We are going to determine our standard aviation and we are going to determine the percentage of text scores above 16.
00:19
So if i write here for this, first we are going to calculate our significance level, which is alpha 1 minus 0 .838.
00:28
That must be equivalent to 0 .1 .8.
00:31
162 so alpha by 2 is 0 .162 divided by we are going to write here 0 .081.
00:41
0 .081 so if i write here z alpha y2 value is z alpha by 2 value must be written as 1 .3984 1 .3984 so basically if i write here for this in the very first case we are going to determine the standard deviation of quiz scores so basically we are going to write here that score attribute is x minus mu divided by sigma we are going to write here for this so here this is 1 .3984 so this must be x minus mu mue value is we are going to write here 14 .5 and this must be divided by sigma sigma is 11 .7 so x value must be x value must be written as 1 .3984 multiplied by 11 .7 plus 14 .5 that must be equivalent to that must be equivalent to we are going to write here for this but we need to correct this this is actually sigma not a different value this value is sigma and this is our x value so definitely x value is we are going to take let's say we are taking here 17 .3 this must be 17 .3 if i write here for this 17 .3 so now the value is so let's erase this to make it more to make it more clear.
02:32
So sigma value must be written as 17 .3, 17 .3 minus 14 .5, which is 2 .8 divided by 1 .3984, which is 2 .8 divided by 1 .3984.
02:51
So this must be written as 0 .2.
02:55
So finally, we are going to write here, hence standard aviation is standard, so let's raise this to make it more clear.
03:13
So if i write here for this, this must be our b part.
03:17
We are going to determine the percentage of test score above 16.
03:21
So we are going to write here x value is greater than 16...