Statistics And Probability Question 340
Question: The mean of five numbers is 30. If one number is excluded, their mean becomes 28. The excluded number is
Options:
A) 28
B) 30
C) 35
D) 38
Show Answer
Answer:
Correct Answer: D
Solution:
[d] Mean of 5 numbers = 30
$ \therefore $ Total sum of 5 numbers $ =30\times 5=150 $ After excluded one number Mean of 4 number will be = 28
$ \therefore $ Total sum of 4 numbers $ =4\times 28=112 $ Thus, excluded number = (sum of 5 numbers - sum of 4 numbers) $ =150-112=38 $
BETA
