Find the median of 12, 7, 15, 9, 20, 11 and 18.
Statistics
Original Khojo Papers practice question — not from a past board paper.
The range is the difference between the largest and the smallest observation. Here it is 22 − 5 = 17.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
The range uses only two of the observations, so it says nothing about how the rest are spread.
From the same topic and chapter, at a similar level.
Find the median of 12, 7, 15, 9, 20, 11 and 18.
Statistics
State one situation in which the median is a better measure of central tendency than the mean, and explain why.
Statistics
The mean of 8 observations is 25. If one observation of 30 is removed, find the mean of the remaining observations.
Statistics
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
Find the mean of the first ten natural numbers, and state what happens to the mean if each number is increased by 5.
Statistics
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