Question

Help.

Answer 1

check this in the mean time

Answer 2

huh?

Answer 3

95% is within 2 standard deviations

Answer 4

subtract and add 8.40 to 31

Answer 5

that's a)

Answer 6

31-8.40 =22.60 and 31 + 8.40 = 39.40

Answer 7

get it?

Answer 8

where did you get 8.40?

Answer 9

to find the upper and lower limits use the fact that approx 95% of data in a normal distribution falls within 2 standard deviations of the mean

\[$31 \pm 2\times 4.20\]

(b) $18.40 is 3 standard deviations below and $43.60 is 3 standard deviations above the mean. approx 99.7% of all data in a normal distribution falls with 3 standard deviations of the mean

Answer 10

yep

Answer 11

so what's the answer?

Answer 12

4.20 twice ....2 standard deviations from the mean ... did you even read the problem? :(

Answer 13

yes i understand that but why double it?

Answer 14

1 standard deviation is 4.20 ... 95% of data in a normal distribution falls within 2 standard deviations of the mean

Answer 15

I don't think I've learned this topic.

Answer 16

that was the question ... 95% of the company's cab rides falls between ...

Answer 17

we were on it before the break

Answer 18

read the link ... just the first few sentences

Answer 19

http://en.wikipedia.org/wiki/68-95-99.7_rule

Answer 20

are you doing an assessment ?

Answer 21

I read it, but it's still a little confusing. yes i am

Answer 22

just say I didn't learn it ... I'll explain it to you in more detail on Monday .

Answer 23

ok thank you.

Answer 24

oh... you're very welcome

Answer 25

:)

Answer 26

lol sarcasm?

Answer 27

lol

Answer 28

just give me the answer to this one, i'm sleepy.

Answer 29

we did

Answer 30

you know i know this one i just don't feel like doing it, give me the answer. pretty please?