Question

help pls

Answer 1

@jim_thompson5910 @Compassionate @Kainui

Answer 2

where are you stuck?

Answer 3

i havent started @jim_thompson5910

Answer 4

so you're not sure what \(\Large \bar{x}\) means ?

Answer 5

im not sure how to do anything... this is a summer class i havent learned anything from this...this is a class to get a credit @jim_thompson5910

Answer 6

\[\Large \bar{x}\] means xbar, this is the sample mean

Answer 7

you add up all the numbers in the sample and then divide by the number of numbers

Answer 8

so you have to first go through the graph given to you and pull out all of the data values

Answer 9

Each one of the dots represents an amount of numbers in the set. So if a 60 had 2 dots on it, you would have 2 60's in the sequence. (60, 60, ... ) so continue doing that for all the numbers

Answer 10

is number 1 80? @jim_thompson5910

Answer 11

you're asking about the sample mean being 80? or something else?

Answer 12

im asking is number 1 80 or 191.47619 @jim_thompson5910

Answer 13

the mean isn't either of those values

Answer 14

well can u help @jim_thompson5910

Answer 15

did you get these values

60,61,63,65,68,68,68,69,69,70,70,72,74,76,76,76,78,79,80,80,80,80,82,82,82,82,84,85,85,86,86,86,87,88,89,90,90,90,90,90,92,92,92,92,95,95,95,98,99,100

??

Answer 16

there are 50 numbers in that list above (each one pulled from each dot)

Answer 17

yes

Answer 18

80.42 @jim_thompson5910

Answer 19

when you added all of the 50 numbers up, what did you get?

Answer 20

4021 @jim_thompson5910

Answer 21

you made an error, it should be larger than 4021

Answer 22

4176 and when divided by 50 i got 83.52 @jim_thompson5910

Answer 23

4176 is too high

Answer 24

thats wat i keep getting @jim_thompson5910

Answer 25

60+61+63+65+68+68+68+69+69+70+70+72+74+76+76+76+78+79+80+80+80+80+82+82+82+82+84+85+85+86+86+86+87+88+89+90+90+90+90+90+92+92+92+92+95+95+95+98+99+100 = 4,086

Answer 26

so 81.72 @jim_thompson5910

Answer 27

yes that is xbar

Answer 28

ok wat about number 2 @jim_thompson5910

Answer 29

use something like this

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

Answer 30

type in all the numbers separated by commas

Answer 31

ok i did now wat am i looking for in number 2 @jim_thompson5910

Answer 32

do you see where it says Standard deviation 10.47259

Answer 33

yes @jim_thompson5910

Answer 34

thats the answer to 2

Answer 35

3 4 and 5 @jim_thompson5910 wat i do

Answer 36

xbar will be used in place of \(\Large \mu\)
the standard deviation is \(\Large \sigma\)

Answer 37

what you need to do is compute 81.72 - k*10.47259 for k = 1, k = 2, and k = 3

also compute 81.72 + k*10.47259 for k = 1, k = 2, and k = 3