Question

first work out the mean value of the lenghts

then work out the Standard Deviation
By the empirical rule 99.7% of the population of alligators should lie between the
mean MINUS 3*SD and the mean PLUS 3*SD

Answer 1

heres my question:


Consider the lengths of alligators to be { 18.7, 12.3, 18.6, 16.4, 15.7, 18.3, 15.8, 14.9, 17.6, 16.4, 16.7, 17.8, 16.2, 13.8, 15.2, 14.7, 13.2, 15.8, 14.6, 16.6, 16.2, 18.1, 17.5, 17.3}. According to the Empirical Rule, 99.7% of the data should fall between what two numbers?


A. 11.1 and 21.3
B. 12.3 and 18.1
C. 12.8 and 19.6
D. 13.4 and 18.8

Answer 2

now i do not know how to find the value length

Answer 3

mean = 16.18,
SD = 1.69

mean + 3SD = ...
mean - 3SD = ...

so what exactly did you not know?

Answer 4

someone tld me to find the value lengths

Answer 5

mean + 3SD = 16.18 + 3*1.69 = 21.25
mean - 3SD = 16.18 - 3*1.69 = 11.11

so A.
wasn't difficult or confusing :P

Answer 6

i keep getting high numbers doing that

Answer 7

read wiki
https://en.wikipedia.org/wiki/68%E2%80%9395%E2%80%9399.7_rule

Answer 8

im gonna do the next one by myself and see if i can get a answer