Question

Will someone tell me if i found the standard deviation correctly ? I will medal and fan .
the data is 76
82
73
93
91
81
79
86
84

Answer 1

First I found the mean which is 82.8
76+82+73+93+91+81+79+86+84=745 745/9 =82.8
Then I did
(73-82.8)2 = (-9.8)2 = 96.04
(76-82.8)2 = (-6.8)2 = 46.24
(79-82.8)2 = (-3.8)2 = 14.44
(81-82.8)2 = (-1.8)2 = 3.24
(82-82.8)2 = (0.-8)2 = .64
(84-82.8)2 = (1.2)2 = 1.44
(86-82.8)2 = (3.2)2 = 10.24
(91-82.8)2 = (8.2)2 = 67.24
(93-82.8)2 = (10.2)2 = 104.04

I add all those up , and divide by (9-1)
96.04 + 46.24 + 14.44 + 3.24 + .64 + 1.44 + 10.24 + 67.24 + 104.04 = 343.56
343.56/8 = 42.95 ,
then take the square root of that . √42.95 = 6.55


the standard deviation is 6.55

Answer 2

@AlexandervonHumboldt2 @Nnesha

Answer 3

yup, that's correct

Answer 4

Really !

Answer 5

https://www.easycalculation.com/statistics/standard-deviation.php

Answer 6

also, your work looks good to me

Answer 7

thank you