Practice Direct Method (13.2.3) - Statistics

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9 questions

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6 questions · about 4 min · pass mark 70%. Hints available.
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3 questions · about 2 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
Calculate the mean of the following grouped data: Class intervals (10-20, 20-30), Frequencies (4, 6).
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Find the class marks and use \\( x = \\frac{\\sum f_i x_i}{\\sum f_i} \\).
Question 2.
Identify the class mark for the interval 25-35.
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Average of lower and upper limits.
3Question 3.
What is the formula for calculating the mean using the Direct Method?
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Recall the parameters represented in the formula.
4Question 4.
True or False: The Direct Method can lead to an approximate mean.
- True
- False
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Think about what approximations imply.
Question 5.
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.
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Set up the calculations precisely with observations.
Question 6.
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.
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Ensure you tally the products methodically.

5 more questions in this section. Enroll free to practise them all.