A group of 10 items has arithmetic mean ...

A group of 10 items has arithmetic mean 6. If the arithmetic mean of 4 of these items is 7.5, then the mean of the remaining items is

A

6.5

B

5.5

C

4.5

D

`5.0`

Text Solution

Verified by Experts

The correct Answer is:

D

Topper's Solved these Questions

MEASURES OF CENTRAL TENDENCY
OBJECTIVE RD SHARMA ENGLISH|Exercise Chapter Test|21 Videos
MEASURES OF CENTRAL TENDENCY
OBJECTIVE RD SHARMA ENGLISH|Exercise Section I - Solved Mcqs|24 Videos
MAXIMA AND MINIMA
OBJECTIVE RD SHARMA ENGLISH|Exercise Chapter Test|29 Videos
MISCELLANEOUS EQUATIONS AND INEQUATIONS
OBJECTIVE RD SHARMA ENGLISH|Exercise Chapter Test|29 Videos

Similar Questions

Explore conceptually related problems

Find the arithmetic mean of:

Find the arithmetic mean of 4 and 12.

The mean of first three items is 14 and mean of next two items is 18. The mean of all the five terms is :

The arithmetic mean of first n natural numbers, is

Find the arithmetic mean of first five prime numbers.

If the median of 5 items is 3 and the median of another 5 items is 7. Find the median of all the 10 items taken together

Find the arithmetic mean between 5 and 9.

If x, y, z are in arithmetic progression and a is the arithmetic mean of x and y and b is the arithmetic mean of y and z, then prove that y is the arithmetic mean of a and b.

Find the arithmetic mean of first 6 natural numbers.

OBJECTIVE RD SHARMA ENGLISH-MEASURES OF CENTRAL TENDENCY-Exercise

If G(1),G(2) are the geometric means fo two series of observations and...
Text Solution
|
If G is the GM of the product of r sets of observations with geometric...
Text Solution
|
A group of 10 items has arithmetic mean 6. If the arithmetic mean of 4...
Text Solution
|
The arithmetic mean of a set of observations is bar(X). If each observ...
Text Solution
|
The weighted mean of the first n natural numbers whose weights are equ...
Text Solution
|
If a variable takes value 0,1,2,3,....,n with frequencies 1,C(n,1),C(n...
Text Solution
|
The weighted mean of the first n natural numbers whose weights are equ...
Text Solution
|
The mean of n observations is X . If the first item is increased by...
Text Solution
|
If bar X1 and bar X2 are the means of two series such that bar X1 lt...
Text Solution
|
The mean of the series x1, x2,...xn is barX. If x2 is replaced by lamb...
Text Solution
|
The mean income of a group of workers is bar(X) and that of another gr...
Text Solution
|
If the variable takes values 0,1,2,…, n with frequencies q^(n),""^(n)C...
Text Solution
|
The AM of n observations is M. If the sum of n-4 observations is a, ...
Text Solution
|
The sum of squares of the deviation of the values of the variable is w...
Text Solution
|
If each of n numbers x(i)=i, is replaced by (i+1)x(i), then the new me...
Text Solution
|
The mean age of a combined group of men and women is 25 years. If the ...
Text Solution
|
Iin a moderately skewed distribution the values of mean and median ar...
Text Solution
|
One of the methods of determining mode is (a) Mode = 2 Median 3 Mean ...
Text Solution
|
The positional average of central tendency is
Text Solution
|
For dealing with qualitative data the best average is:- a) AM b) GM ...
Text Solution
|