I used my favourite stats calculator
http://davidmlane.com/hyperstat/z_table.html
set it to
"value from an area"
and entered the following data
area = .25
mean = 50
SD = 10
and clicked on "below" to get
43.258 , which you also got, I would say we are correct
The amount of Jen’s monthly phone bill is normally distributed with a mean of $50 and a standard deviation of $10. Find the 25th percentile.
A. About $46.30
B. About $43.30
C. About $43.40
D. about $43.20
I came up with $43.26 which its not a choice. Please help!!
2 answers
Try choosing B
43.258 rounded to one decimal place would be
43.3 , but they should not have placed that zero at the end.
43.258 rounded to one decimal place would be
43.3 , but they should not have placed that zero at the end.
1 answer