Define the range of a set of observations and find the range of 14, 9, 22, 5 and 18.
Statistics
Original Khojo Papers practice question — not from a past board paper.
12
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Arranged in order the values are 7, 9, 11, 12, 15, 18, 20. There are seven of them, so the median is the fourth, which is 12.
From the same topic and chapter, at a similar level.
Define the range of a set of observations and find the range of 14, 9, 22, 5 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