The mean of 50 observations in a grouped table is 30. Later it was found that an entry with frequency contributing fi*xi = 200 was wrongly read; the correct contribution should have been 320 (frequencies unchanged, total still 50). What is the corrected mean?

Question

Accepted Answer

32.4. Original sum fi*xi = 30*50 = 1500. Corrected sum = 1500 - 200 + 320 = 1620. Corrected mean = 1620/50 = 32.4.

The mean of 50 observations in a grouped table is 30. Later it was found that an entry with frequency contributing fi*xi = 200 was wrongly read; the correct contribution should have been 320 (frequencies unchanged, total still 50).
What is the corrected mean?

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More Class 10 Mean of Grouped Data practice

The mean of 50 observations in a grouped table is 30. Later it was found that an entry with frequency contributing fi*xi = 200 was wrongly read; the correct contribution should have been 320 (frequencies unchanged, total still 50).What is the corrected mean?

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 10 Mean of Grouped Data practice

The mean of 50 observations in a grouped table is 30. Later it was found that an entry with frequency contributing fi*xi = 200 was wrongly read; the correct contribution should have been 320 (frequencies unchanged, total still 50).
What is the corrected mean?