The mean weight of newborn infants at a community hospital is said to be 6.6 pounds. A sample of seven infants is randomly selected and their weights at birth are recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds. What is the sample mean?
A) 6.6
B) 7.6
C) 1.177
D) 2.447

Question

Quizplus · Accepted Answer

The sample mean is calculated by adding up all of the individual weights and dividing by the number of infants in the sample. 
(9.0 + 7.3 + 6.0 + 8.8 + 6.8 + 8.4 + 6.6) / 7 = 7.6. 
Therefore, the best choice is B.

The Mean Weight of Newborn Infants at a Community Hospital