Ask Me Help Desk
>
Education
>
Homework Help
>
Math & Sciences
> Z score calculation
PDA
View Full Version :
Z score calculation
dvitalo
Sep 24, 2009, 05:34 PM
With a mean of 69 mph and a SD of 12.6 mph, what percentage of cars were travelling at 60 mph or slower?
galactus
Sep 26, 2009, 11:22 AM
Just use the formula z=\frac{x-{\mu}}{\sigma}
z=\frac{60-69}{12.6}
Look up the corresponding value in a z table.