rs agarwal class 9 exercice 18 question no.7 plz solve tis question
Attachments:
Answers
Answered by
0
The correct mean is 39.4 because:-
Mean = Total sum of characters / No. of characters.
Mean = 39
No. of characters (students) = 50
Hence, 39 = Total sum of characters / 50
39 * 50 = 1950
But instead of 23, the actual no. was 43.
So, 1950 + (43-23)
= 1950 + 20
= 1970
Actual Mean = 1970 / 50
= 39.4
Mean = Total sum of characters / No. of characters.
Mean = 39
No. of characters (students) = 50
Hence, 39 = Total sum of characters / 50
39 * 50 = 1950
But instead of 23, the actual no. was 43.
So, 1950 + (43-23)
= 1950 + 20
= 1970
Actual Mean = 1970 / 50
= 39.4
Similar questions