What is the standard deviation of the set {2, 1, 1, 2, 2, 3}?

Plz hurry evaluate the expression a+b where a=8 and b=19

Sasha delivers newspapers to subscribers that live within a 4 block radius of her house. sasha's house is located at point (0, -1). points a, b, c, d, and e represent the houses of some of the subscribers to the newspaper. to which houses does sasha deliver newspapers?

What is the solution for 6 - 7/8? explain the steps.