You collect a sample of 20 monthly employee salaries from Branch A and 20 monthly employee salaries from Branch B. If x ¯ 1 1 = 5100.8 , x ¯ 2 2 = 3837.7, s 1 = 945.199316 and s 2 = 912.399099, what is the value of the pooled variance? Group of answer choices

a. 293.76
b. 928.94
c. none of these
d. 862936.93