1. Find the mean for the given sample data.
1, 5, 8, 12, 15, 19
2. Find the standard deviation for the above sample data. Round the answer to 1 decimal places
3. Find the median for the following samples
a) 5, 19, 27, 9, 30, 23, 15
b) 19, 27, 10, 28, 17, 40, 32, 25
_
4. Find the mean of the data summarized in the given frequency distributions, X. Round the answer to 2 decimal places.
Class limits Class middle point Xi Frequency
fi
Xi ´ fi
6 – 8 5
9 -11 2
12 – 14 4
15 – 17 1
åfi = åXi ´ fi =
_ åXi ´ fi
X = ————— =
åfi
