Question

stats help needed...

Answer 1

i need help with part A

Answer 2

i dont know what to do after i get the z-score...
which is -0.966 (when rounded)

Answer 3

@estudier @myininaya @phi @sasogeek @Tyler1992

Answer 4

@bahrom7893

Answer 5

like what is the next step? i have the zscore and i have the graph drawn out (68-95-99.7)

Answer 6

You look it up in the z-table. Sorry I'm bad at stat, hang around while help comes.

Answer 7

@ash2326 @Jemurray3

Answer 8

@amistre64 @satellite73

Answer 9

@Libniz

Answer 10

look in you z table for the area above -0.966 std dev.

it looks like about 83 %

Answer 11

can you show me the work? im confused on the last steps

Answer 12

like how would i solve it without using Excel or something like that

Answer 13

You would use a z-table or calculator
Do you use a table ?

Answer 14

i dont know what a z table is to be frank

Answer 15

Here is a site that does the conversion
http://www.tutor-homework.com/statistics_tables/statistics_tables.html

How are you doing these problems?

Answer 16

this is the first one like this on my hw

Answer 17

your book must talk about how to do this?

Answer 18

but to do a)
select standard distribution (the first one shown)
right tail
type in -0.966 for z and have it calculate the area under the curve to the right of that z score. that is the chance the weight is above this z score

Answer 19

any way this can be done on a graphing calc rather than on this site?

Answer 20

if it knows about normal distributions (do they?)
otherwise
http://en.wikipedia.org/wiki/Normal_distribution#Numerical_approximations_for_the_normal_CDF
is a (messy) way

Answer 21

using normal

since ur z score is -0.966 round to 2 decimal u'll have -0.97

it means u'll have

P(z>=-0.97)
because it is over 1050

u'll have

1-P(Z<=-0.97)

on the z table -0.97 it hase the probability of 0.1660

now

1-(0.1660)
0.834
wich by conclusion is 83.4%

Answer 22

do u get it?

Answer 23

yeah i get everything except the part where i get the 0.1660.
i dont know how to get it without using the site Phi gave me above. ^^^

Answer 24

http://www.tutor-homework.com/statistics_tables/statistics_tables.html

Answer 25

check this tables

Answer 26

do u see -0.97 ?

Answer 27

yes i get that by doing the formula for z score and rounding

Answer 28

do u see the value that correspond to it ?

Answer 29

not really no. i dont get how that part works.

Answer 30

the deshes represents some numbers on the table ;right