Homework Help: gre math prob of a sample

Posted by luckybee on Tuesday, January 10, 2012 at 10:50pm.

sample standard deviation = 3
sample mean = 68
n=30
what is the probability that one student selected at random from the sample will have a height within one sample standard deviation of the sample mean?

a. 1.00
b. 0.73
c. 0.57
d. 0.23

gre math prob of a sample - PsyDAG, Wednesday, January 11, 2012 at 1:07pm
mean ą 1 SD = 68.26%

This is true for any normal distribution. Is there something you are not telling me?
re-post for PsyDad gre math prob of a sample - luckybee, Wednesday, January 11, 2012 at 7:42pm
There is a picture of a histogram. the numbers on the x-axis are: 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, and 76. the numbers on the t-axis are: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. there are additional symbols: sigma x =2100, sigma x^2=142540, and Sx=3

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