Question

PLEASE HELP!!!!! WILL GIVE MEDAL!!!!!!!
Sherry missed the lesson on normal distribution and needs to do her homework. Explain to Sherry how to use the mean and standard deviation of a normal distribution to determine the top 7% of the population.

Answer 1

yes so im assuming you are familiar with z - scores

Answer 2

?

Answer 3

sorry feel asleep there, im just ready to finish this. @MathMan77

Answer 4

*fell

Answer 5

so you are familiar with z scores?

Answer 6

a little

Answer 7

ok well basically they are a way to determine the percent tile of somone within a sample/population

Answer 8

for example if std dev = 5 mean = 10 a z score of 1.5 = 17.5

Answer 9

so there is a specific z score that represents 7 percent do u have the table?

Answer 10

yea,one sec.

Answer 11

ok so 93% of students are to the left of 1.48

Answer 12

do you see that on your table?

Answer 13

yea.

Answer 14

great so if I was explaining this I would say you take the mean and add the std dev*z-score(1.48) and anyone greater then that number would be in the top 7 percent of that normal population

Answer 15

does that make sense?

Answer 16

yes, i makes a lot of sense!!!! Could u keep working it out?

Answer 17

@MathMan77

Answer 18

*it

Answer 19

what more do you need?

Answer 20

you didnt really give me numbers just says to explain how to find top 7 percent

Answer 21

mean of normal pop + std dev of normal pop x z - score(1.48) >= answer is in top 7 percent

Answer 22

srry, i didnt know that it was so simple.Thank you for all ur help, now i can sleep in peace. :)

Answer 23

<=*

Answer 24

haha of course!

Answer 25

good night im hitten the hay to :)