Question

a set of data has a normal distribution with a mean of 50 and a standard deviation of 8 what percent of the data should be greater than 34
99
97.5
95
13.5

Answer 1

You can use a table or a calculator to find this. Are you allowed to use a calculator, does your teacher allow it.

Answer 2

Yes.

Answer 3

ok lets use the TI 83/84

Answer 4

The what?

Answer 5

its a type of calculator

Answer 6

I have a casio graphing calculator.

Answer 7

let's use this online calculator https://www.easycalculation.com/statistics/normal-distribution.php

Answer 8

Okay.

Answer 9

enter these numbers and hit calculate http://prntscr.com/74n3wk

Answer 10

I did.
I got 0.0228

Answer 11

yes, but that doesnt seem right

Answer 12

Okay.
Is there a formula I can use?

Answer 13

something is wrong with that calculator

Answer 14

well it involves an integral

Answer 15

I'm just going to guess.
It's 2:00am where I live, I'm getting tired.
Thank you for the help.

Answer 16

it looks like the calculator has the buttons switched, the button "Above" should be button "Below" and vice a versa

Answer 17

http://prntscr.com/74n4sy

Answer 18

the probability that z is greater than 34, when compared to a normal distribution with a mean of 50, and standard deviation of 8 is

P(z > (x - mean)/sd)

P(z > (34 - 50)/8)

or simply

P(z > -2)

http://www.wolframalpha.com/input/?i=P%28z+%3E+%2834+-+50%29%2F8%29

i think your site gave you P(z<-2)

Answer 19

the answers look more like they are from the empirical rule so its best to determine if we are using an approximation or something more exact.

Answer 20

about 95% of the data is within in 2 standard deviation of the mean, the remaining 5% is split up between the tails ... 2.5% in each

we want to include one tail giving us 95+2.5

Answer 21

@amistre64
This website of 'easy calculators' is strange,
what is this supposed to be :

http://prntscr.com/74oj2x

Answer 22

standard normal distribution 35?

Answer 23

heheh, i wouldnt even begin to know what that is. i just use the wolf of pencil and paper. sometimes ill google a table