40.7k views
17 votes
I f the mean of 5 observation is 15 and four of them are 11, 12, 19, 20. what is the fifth number

User Martiert
by
8.4k points

2 Answers

2 votes

Answer:

13

Explanation:

the mean is calculated as

mean =
(sum)/(count)

let x be the fifth number , then


(11+12+19+20+x)/(5) = 15


(62+x)/(5) = 15 ( multiply both sides by 5 to clear the fraction )

62 + x = 75 ( subtract 62 from both sides )

x = 13

User Joe Jordan
by
7.9k points
7 votes

Answer:

13

Explanation:

11 * 12 * 19 * 20 * 13 = 75

75/5 = 15

User Darshana
by
8.3k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories