Hello everyone, I just have one Alg II math question that I need help on. This question is dealing with 'Standard Scores'. Thanks in advance for all your help in assisting me, thanks much!

Heres the question:

Use technology or a z-score table to answer the question.

The average balance at a credit union is normally distributed with a mean of $240 and a standard deviation of $100. Joe's balance is $260.

What percent of all accounts at the credit union have a balance less than Joe's?

Round your answer to the nearest whole number.

Options:

42%

58%

64%

88%

Guest Apr 23, 2018

#1**+1 **

Don't know much about this but I think I can feel my way around......LOL!!!

Mean = $240

SD = $100

Joe's Balance = $260

Z = [ Joe's Balance - Mean Balance ] / SD =

[ 260 - 240 ] / 100 =

20/100 =

.2

Looking up .2 in a table of Z scores we find that the value is .5793

So....58% have a balance less than Joe's

CPhill
Apr 23, 2018