Question

What is the mean of the set of numbers? {–9, –8, 4, –1} A. –5.5 B. –3.5 C. –2.8 D. 14

Answer 1

$Formula\ for mean=\frac{sum\ of\ numbers}{amount\ of\ numbers}\\\\ Mean=\frac{-9-8+4-1}{4}=\frac{-14}{4}=-3,5\\\\Mean\ is\ equal\ to\ -3,5.$

Answer 2

Mean = (- 9 - 8 + 4 - 1) / 4
         = (- 14) / 4
         = - 3,5

Answer : B