Help please..Suppose that income in a sample is approximately normally distributed with M = $20,000.00 and s = $2000.00. Use the z table to determine what income level defines the:

a. top 5% of salaries

b. bottom 33% of salaries

Question

Help please..Suppose that income in a sample is approximately normally distributed with M = $20,000.00 and s = $2000.00. Use the z table to determine what income level defines the:


a.	top 5% of salaries


b.	bottom 33% of salaries

amistre64 · Answer

what z score is closest to .0500 ?

amistre64 · Answer

since:  z = (x-mean)/sd

x = mean + z(sd)

or in this case:  M + z(s)

anonymous · Answer

the z score will be 1.65. How do i use it in the equation? is my z score x?

amistre64 · Answer

z is your z sscore

amistre64 · Answer

and you might have some legend that says to 95% we use 1.645

amistre64 · Answer

but thats your call

anonymous · Answer

okay I think I get it. Thank you very much

amistre64 · Answer

youre welcome