Does your book have a section on Normal Distributions?
You need to find the Z-score from a table like this:
http://www.beanactuary.org/exams/pre...ion_Table.html
Find the Z-score for 1 - 0.011 = .989
Then solve
"The weekly earnings of fastfood restaurant employees are normally distributed with a mean of $395. If only 1.1% of the employees have a weekly income of more than $429.35, what is the value of the standard deviation of the weekly earnings of the employees?"
Can someone not just provide and answer, but HOW to come to this answer? I am confused. I can't even find this type of question answered in my college book. Calculations would be great.
Thanks,
Lorelei7
Does your book have a section on Normal Distributions?
You need to find the Z-score from a table like this:
http://www.beanactuary.org/exams/pre...ion_Table.html
Find the Z-score for 1 - 0.011 = .989
Then solve
Lorelei7 (10-22-2013)
If you knew the mean and standard deviation would you be able to find the proportion of employees that have a weekly income of more than 429.35?
I don't have emotions and sometimes that makes me very sad.
so;
0989=429.35-395/stand dev
.989 = 34.35/stand dev then multiply stand dev on both sides = .989(std dv) = 34.35
.989/.989 (to get std. dv alone) = 34.35/.989 = std dev=34.7321 ?
Is this correct? From this I am still unsure if the 34.7321 is correct?
Please forgive me as IDH the sigma sign handy; as well as being confused if this is the answer?
Tweet |