Correct option is D
Given:
1. Number of items ( n ) = 100
2. Incorrect mean = 30
3. Incorrect data points = 32 and 12
4. Correct data points = 23 and 12
Formula Used:
1. Total sum of items (Sum} :
Sum = n Mean
2. Adjusted sum:
3. Correct Mean:
Solution:
1. Calculate the incorrect total sum:
2. Adjust the total sum:
Replace 32 with 23 (12 remains unchanged):
Change in Sum = 23 - 32 = -9
Adjusted sum:
Adjusted Sum = 3000 - 9 = 2991
3. Calculate the correct mean:
Correct Mean =
4. Round the mean:
The rounded mean is 29.9 .
Final Answer:
D. 29.9
English
25 Questions
100 Marks
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