## A set of 12 test scores has an average of 500 and a standard deviation of 50. Which of the following sets of additional

##### This topic has expert replies
Legendary Member
Posts: 2898
Joined: 07 Sep 2017
Thanked: 6 times
Followed by:5 members

### A set of 12 test scores has an average of 500 and a standard deviation of 50. Which of the following sets of additional

by Vincen » Fri Jan 28, 2022 5:00 am

00:00

A

B

C

D

E

## Global Stats

A set of 12 test scores has an average of 500 and a standard deviation of 50. Which of the following sets of additional test scores, when combined with the original set of 12 test scores, must result in a combined data set with a standard deviation less than 50?

(A) 6 test scores with an average of 450 and a standard deviation of 50.
(B) 6 test scores with an average of 500 and a standard deviation of 25.
(C) 6 test scores with an average of 550 and a standard deviation of 25.
(D) 12 test scores with an average of 450 and a standard deviation of 25.
(E) 2 test scores with an average of 550 and a standard deviation of 50.