Statistics area under the standard normal curve

[Louise Johnson]

Question#1

The area under the standard normal curve between -3.2 and -2.0 iscorrect to two decimal places)
my answer:
.0228-.0007=.022

Question #2

The heights of the students in a grade 11 math class are normally distributed with a mean 168cm and standard deviation 40cm. Determine the Z-value for a student 160cm tall.
My answer:
\(\displaystyle \L\\Z = \frac{{x - \mu }}{\sigma } = \frac{{160 - 168}}{{40}} = - 0.2\)

Have only been doing Statistics a short while so I thought I better see where I am at. Thanks for giving these a quick look.
Sincerly
Louise

 

[Pilly151]

P(Z<-3.2) =.0000 (you used -3.02 accidentally)
P(Z<-2.0) =.0228

.0228 - .0000 = .0228

 

[Louise Johnson]

thanks Pilly 151, Unbelievable it has been this long since anybody has replied. You are apparently the only brave person who will deal with stats stuff. (thankfully I am finished my stats exam and have moved on)
Thanks again
Louise