Using a calculator, you should get a sample standard deviation of approximately 2.5 hours
If you want to find the standard deviation by hand, you need to do the following steps
Find the mean muSubtract each data value from the mean to get (x-mu)Square each result from step 2, so we now have (x-mu)^2Add up each square from the previous stepDivide that result over n-1. In this case n = 14 is the sample size. This computes the sample variance.Finally, apply the square root to get the sample standard deviation.The teacher data set has a sample standard deviation of roughly 2.5 hours; compare this with the sample standard deviation of the students 1.9 hours, and we see that the teacher data set is more spread out. The larger the standard deviation is, the more spread out the data set will be.
Hello,
V = 7 cm * 7 cm * 10 cm = 490 cm³
Bye :)