Question

does anyone on here know how to read the Z Score Table?

Answer 1

it's been a while, but I can give it a shot, what was your exact question? : )

Answer 2

life saver!!!

Answer 3

lol, I'm assuming you were given a table like this one? http://www.regentsprep.org/regents/math/algtrig/ats7/zchart.htm

Answer 4

okay, so there's a few questions that are contributed into one problem. however i know the first few steps, but I'm stuck whenever it comes to finding the exact percentage since i cant figure out how to read the table and I've looked for the answers online and they all have different answers to the same question.

Answer 5

and yes, correct

Answer 6

OK, yeah, I've got the picture... sometimes it's hard to interpret the table at first. : )

Answer 7

so i also have a formula, which is

Answer 8

ooh, a formula! the excitement is real!

Answer 9

Alrighty, I am familiar with that one.

Answer 10

basically, the z-score is just the (data - mean) all divided by the standard deviation

Answer 11

lol yeah! sorry that bottom one is crappy lol so the question is: What percentage of puppies will have the heart rates of less than 187 heart beats p/m

Answer 12

the mean is: 180, the sd=6 and x=187 if im correct

Answer 13

OK, so I'm guessing that the problem has told you the mean (or you figured that out before) and has told you the standard deviation (or you figured that out before), so yes, x = 187 would be the right choice.

Answer 14

now, we've got to calculate the z-score

Answer 15

if i did the math correct i got the answer to be 1.66666667 which is then reduced to 1.17

Answer 16

since the teacher is asking for the nearest hundredths place

Answer 17

yep, I agree

Answer 18

So we know the z-score is z = 1.17

Answer 19

yup so then do we look for 1.1 on the y-axis of the chart and then the .07 on the x-axis?

Answer 20

Yes, that is exactly what you would do. : ) We will check the answer you get using our common sense to make sure it is the right one (since 187 is bigger than the mean, the percentage should be bigger than 0.5). : )

Answer 21

okay so let me look at the chart

Answer 22

okay so i got .8790= 87.90?

Answer 23

Yep, me too!

Answer 24

Here's a picture of how I read the chart

Answer 25

I think of 1.17 as 1.17 = 1.1 + 0.07 and that helps it make sense to me.

Answer 26

okay, so is that all we do? theres no other step we are missing? 87.90 would be the final answeer?

Answer 27

So we would say that the percentage of puppies with heart beats less than 187 beats per minute is 87.90%

Answer 28

okay, so its the same thing for a negative number as well correct?

Answer 29

yes, there is only one thing that you have to keep in mind with these z-score questions...

Answer 30

okay, what is that
?

Answer 31

As long as the question says, "Find the percentage LESS THAN something" you just read the table as is.

Answer 32

If the question says, "Find the percentage GREATER THAN something" you have to do:
1 - (the table value) to get the true percentage

Answer 33

okay >.< what if it says "What percentage of puppies will have heart rates BETWEEN 170 and 187?

Answer 34

Haha! I forgot about that one! Let me draw a picture to show you.

Answer 35

lol okay!:)