Question

Plz help!!
Will give medal!! :D

d. If 200 students took this exam approximately how many would have a z-score below 2?

Answer 1

this is the graph

Answer 2

@twwc960

Answer 3

What is the z-score formula?

Answer 4

that is the z score formula :)

Answer 5

@jim_thompson5910

Answer 6

does your teacher want you to use a table? or can you use a calculator?

Answer 7

a calculator is fine :)

Answer 8

what kind of calculator do you have?

Answer 9

scientific calculator on my computer :)

Answer 10

*I

Answer 11

ok we'll use wolfram alpha for this problem

Answer 12

it's asking `how many would have a z-score below 2?`

first we need to find the proportion of students below z = 2

this is equivalent to finding the probability of getting a z score less than 2, ie P(Z < 2)

Answer 13

oh ok

Answer 14

If you typed `P(Z < 2)` into wolfram alpha, you would get

http://www.wolframalpha.com/input/?i=P(Z+%3C+2)

what is the decimal result is shows?

Answer 15

wait a sec its taking a bit to load :)

Answer 16

0.97725? :)

Answer 17

yes, so we'll multiply that with the 200 people to get 0.97725*200 = 195.45

so about 195.45 people

of course, we can't have 0.45 of a person so we round to the nearest whole number to get about 195 people

Answer 18

ah ok :)