Published by:
CGP EDU Academic Team
Published on: August 14, 2026
Let the mean and variance of 8 numbers 
be 
and 
, respectively. Then the mean of 4 numbers 
is:
Text Solution
Verified by ExpertsThe correct answer is:
A
Mean 
.
Variance 
.
Known squares: 
, so 
.
.
.
Mean of 
.
──────────────────────────────────────────────────────────────────────────────────────────
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
Let and for some . If the mean and variance of the elements of Y are 30 and 750, respectively, th…
If the mean deviation about the median of the numbers is 500 , then is equal to :
If the mean and the variance of the data
are and 19 respectively, then the value of is
Let the mean and variance of 7 observations , be 8 and 16 respectively. Two numbers are chosen fro…
The mean and variance of 10 observations are 9 and 34.2, respectively. If 8 of these observations a…
The mean and variance of a data of 10 observations are 10 and 2, respectively. If an observations …