The mean of 100 observations is 50. If one of the observations was misread as 50 instead of 40, the correct mean is :
40
49.9
50
50.1

Question

The mean of 100 observations is 50. If one of the observations was misread as 50 instead of 40, the correct mean is : 1. 40 2. 49.9 3. 50 4. 50.1

KnowledgeBoat · Accepted Answer

Sum of observations when observations were misread = Number of observations × Initial Mean = 100(50) = 5000 To find the correct sum We need to subtract the wrong value and add the correct value, Sum = 5000 - 50 + 40 = 4990 Mean = = 49.9 Hence, option 2 is the correct option.

x	f
5	3
15	p
25	3
35	6
45	2

Marks	Number of students
0 – 10	12
10 – 20	18
20 – 30	27
30 – 40	20
40 – 50	17
50 – 60	6

Mathematics

The mean of 100 observations is 50. If one of the observations was misread as 50 instead of 40, the correct mean is :
40
49.9
50
50.1

Measures of Central Tendency

Related Questions

If the mean of the following data is 25, the value of p is equal to :
x f
5 3
15 p
25 3
35 6
45 2
2
3
4
5

Consider the table given below :
Marks Number of students
0 – 10 12
10 – 20 18
20 – 30 27
30 – 40 20
40 – 50 17
50 – 60 6
The mean of the marks given above is :
6
18
27
28

Mathematics

The mean of 100 observations is 50. If one of the observations was misread as 50 instead of 40, the correct mean is :4049.95050.1

Measures of Central Tendency

Related Questions

If the mean of the following data is 25, the value of p is equal to :xf5315p2533564522345

Consider the table given below :MarksNumber of students0 – 101210 – 201820 – 302730 – 402040 – 501750 – 606The mean of the marks given above is :6182728

The mean of 100 observations is 50. If one of the observations was misread as 50 instead of 40, the correct mean is :
40
49.9
50
50.1

If the mean of the following data is 25, the value of p is equal to :
x f
5 3
15 p
25 3
35 6
45 2
2
3
4
5

Consider the table given below :
Marks Number of students
0 – 10 12
10 – 20 18
20 – 30 27
30 – 40 20
40 – 50 17
50 – 60 6
The mean of the marks given above is :
6
18
27
28