#1. Find the mean of the sample.
\(-12, 9\)

#2. Find the median of the sample.
\(-8, -8, 12, 18, 14\)

#3. Find the mode of the sample.
\(-1, -4\)

#4. Find the range of the sample.
\(7, 6, 10, 2, 9, 3, 9, 4, 3, 4\)

#5. Find the lower quartile of the sample.
\(8, 1, 7, 4, 2, 6, 6, 2, 3, 10\)

#6. Find the lower quartile of the sample.
\(10, 7, 2, 9, 1, 5, 8\)

#7. Find the upper quartile of the sample.
\(-9, -7, 8, -7, -9\)

#8. Find the upper quartile of the sample.
\(-1, \frac{-2}{3}, \frac{-1}{2}, \frac{-1}{3}, 0, 0, 2, 3\)

#9. Find the inner quartile range (IQR) of the sample.
\(1, 1, 2, 3, 8, 8, 9, 10, 10\)

#10. Find the inner quartile range (IQR) of the sample.
\(5, 10, 1, 4, 2, 1, 8, 7, 6\)

#11. Find the mean absolute deviation (MAD) of the sample.
\(-6, 1, 3, 3, 4, 4, 6, 7, 9, 9\)

#12. Find the mean absolute deviation (MAD) of the sample.
\(-1, \frac{-3}{4}, \frac{-1}{4}, 0, 0, 1\)

#13. Find the mean absolute deviation (MAD) of the sample.
\(\frac{3}{2}, \frac{1}{2}, \frac{3}{4}, -1, \frac{-3}{2}, -1, 0\)

#14. Find the mean absolute deviation (MAD) of the sample.
\(-4, -4, \frac{-1}{2}, 0, \frac{1}{3}, 1, 1, 4\)