Statistics
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Exam-level questions worked step by step. Try each one yourself first — then expand the solution and compare routes.
Q1.
The average weight of 30 boys is 62 kg and that of 20 girls is 58 kg. Find the average weight of the class.
Q2.
The mean of a distribution is 27 and the mode is 45. Using the empirical relation, the median is:
Q3.
Find the median of 8, 3, 11, 6, 14, 5.
Q4.
The mean of the squares of the first 10 natural numbers is:
Q5.
The standard deviation of a set of observations is 7. If each observation is multiplied by 3 and then 5 is added, the new standard deviation is: