Which of the choices is the standard deviation of the sample shown here?

19, 20, 21, 22, 23

a.2.5
b.21
c. square root of 2.5
d.2
e. square root of 2

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? probability distribution px(x) 6 hours 7 hours 8 hours 9 hours 10 hours 0.62 0.78 пол