A Wilcoxon rank sum test for comparing two independent samples involves two samples of sizes 6 and 10. The alternative hypothesis is that the location of population 1 is different from the location of population 2. Using a 0.05 significance level, the appropriate critical value is 32.

Standard deviation is the square root of variance.

Simplify $7i-(3-25i)+\sqrt{-81}$ and write in standard form.

A) $-3-9i$
B) $-3+41i$
C) $29i$
D) $-3-41i$
E) $3+41i$

​What is the next number in the following series: 5, 15, 45, 135, ?