00:01
Hello students, according to the given question we have to find the mean standard deviation values.
00:07
So, given the data given the data 12 .75, 10 .75, 7 .50, 7 .25, 11 .50, 9 .25, 8 .25 and 9 .25.
00:29
So, total n is equal to 8 values.
00:33
In the a bit we have to calculate mean that is x bar is equal to summation x by n that is equal to 76 .5 by 8 which is equal to 9 .5625.
00:47
So x bar is equal to 9 .56.
00:51
In the b bit to find standard deviation is equal to square root of 1 by n minus 1 summation xi minus x bar whole square that is equal to square root of 1 by 8 minus 1 into 12 .75 minus 9 .56 whole square plus up to the last term that is 9 .25 minus 9 .56 whole square.
01:24
So that will be equal to square root of 3 .8348 which is equal to 1 .958.
01:32
So standard deviation is equal to 1 .96.
01:36
In the c bit we have to calculate percentile value...