Same chapter3 marksDifficulty: Medium
Define the range of a set of observations and find the range of 14, 9, 22, 5 and 18.
Statistics
3 marksDifficulty: Medium
Find the mean of the first ten natural numbers, and state what happens to the mean if each number is increased by 5.
Original Khojo Papers practice question — not from a past board paper.
Answer
The mean is 5.5, and it becomes 10.5.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The sum of the first ten natural numbers is 55, so the mean is 5.5. Adding a constant to every observation adds that constant to the mean.
Related questions
From the same topic and chapter, at a similar level.
Same chapter3 marksDifficulty: Medium
The mean of five numbers is 18. If one number is excluded the mean of the remaining four is 16. Find the excluded number.
Statistics
Same chapter3 marksDifficulty: Medium
The mean of 8 observations is 25. If one observation of 30 is removed, find the mean of the remaining observations.
Statistics
Same chapter3 marksDifficulty: Medium
Find the median of 12, 7, 15, 9, 20, 11 and 18.
Statistics
Same chapter3 marksDifficulty: Medium
State one situation in which the median is a better measure of central tendency than the mean, and explain why.
Statistics
Same chapter3 marksDifficulty: Medium
The mean weight of 30 students in a class is 45 kg. Ten new students of mean weight 52 kg join the class. Find the mean weight of the whole class now.
Statistics