• CRIME BLOG
  • Blog
  • Author
  • Pretty City Murder
  • Chapter 1
  • Contact
  • Short Stories
    • Deaf
    • Anonymous
    • Isolated
    • Apartment 19
    • Letters
    • Phantasmal
  • True Stories
    • Talk
    • Heel
    • Priest
    • Best
    • Sweet
    • Father
  • Blog & Crime Blog
  • Piano
  • Servile Obedience
  • Society of St. Pius X
  • How It Happened
  • Website Stats
  • Latin Mass in History
  • Catholicism in Spain
  • Reading List
  • Mass of the Ages
ROBERT E DUNN

arithmetic mean

7/27/2022

0 Comments

 
A set of nine numbers has a mean of 10. A tenth number was added to this set, and the mean increased to 12. What was the number that was added to the set?

The arithmetic mean of a set is the sum of all the values divided by the total number of values. The arithmetic mean is usually called the average.

A set of nine numbers that has a mean of 10 must total 90
90/9 = 10

A set of 10 numbers that has a mean of 12 must total 120
120/10 = 12

Thus, the difference between the set of 10 numbers and the set of nine numbers is
120 – 90 = 30

Answer: the number that was added to the set was 30.
0 Comments



Leave a Reply.

    RSS Feed

    Categories

    All
    Art
    Comedy
    Crime
    English
    Faith
    Film
    History
    Latin
    Math
    Music
    Photography
    School

    Archives

    July 2025
    June 2025
    May 2025
    April 2025
    March 2025
    February 2025
    January 2025
    December 2024
    November 2024
    October 2024
    September 2024
    August 2024
    July 2024
    June 2024
    May 2024
    April 2024
    March 2024
    February 2024
    January 2024
    December 2023
    November 2023
    October 2023
    September 2023
    August 2023
    July 2023
    June 2023
    May 2023
    April 2023
    March 2023
    February 2023
    January 2023
    December 2022
    November 2022
    October 2022
    September 2022
    August 2022
    July 2022
    June 2022
    May 2022
    April 2022
    March 2022
    February 2022
    January 2022
    December 2021
    November 2021
    October 2021
    September 2021
    August 2021
    July 2021
    June 2021
    May 2021
    April 2021
    January 2021
    December 2020
    October 2020
    September 2020
    August 2020
    July 2020
    August 2018
    July 2018
    June 2018
    May 2018
    April 2018

Proudly powered by Weebly
  • CRIME BLOG
  • Blog
  • Author
  • Pretty City Murder
  • Chapter 1
  • Contact
  • Short Stories
    • Deaf
    • Anonymous
    • Isolated
    • Apartment 19
    • Letters
    • Phantasmal
  • True Stories
    • Talk
    • Heel
    • Priest
    • Best
    • Sweet
    • Father
  • Blog & Crime Blog
  • Piano
  • Servile Obedience
  • Society of St. Pius X
  • How It Happened
  • Website Stats
  • Latin Mass in History
  • Catholicism in Spain
  • Reading List
  • Mass of the Ages