13.2.3 - Direct Method
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Practice Questions
Test your understanding with targeted questions
Calculate the mean of the following grouped data: Class intervals (10-20, 20-30), Frequencies (4, 6).
💡 Hint: Find the class marks and use \\( x = \\frac{\\sum f_i x_i}{\\sum f_i} \\).
Identify the class mark for the interval 25-35.
💡 Hint: Average of lower and upper limits.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the formula for calculating the mean using the Direct Method?
💡 Hint: Recall the parameters represented in the formula.
True or False: The Direct Method can lead to an approximate mean.
💡 Hint: Think about what approximations imply.
1 more question available
Challenge Problems
Push your limits with advanced challenges
If you have the following marks data grouped into ranges 0-10, 10-20, with frequencies of 5, 15, calculate the mean and explain how the grouping affects the accuracy.
💡 Hint: Set up the calculations precisely with observations.
Using a frequency distribution, calculate the mean of frequencies 2, 3, 5, 7 across intervals 0-10, 10-20, 20-30 and reflect on the methods used.
💡 Hint: Ensure you tally the products methodically.
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