Andrea has averaged the ages of 12 people in her class, and the mean is 16 years old. she removes one person from the data set and the mean becomes 15 years old. which age was removed from the data set?

a.) 15
b.) 16
c.) 27
d.) 28

The human resources manager at a company records the length, in hours, of one shift at work, x. he creates the probability distribution below. what is the probability that a worker chosen at random works at least 8 hours? 0.62 0.78 0.84 0.96