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Statistics
Mathematics · CBSE Class 10 · English Medium · 20 questions and answers
Sample questions
- Q: What is the modal class?
- A: The class interval with the greatest frequency.
- Q: Write the direct-method formula for the mean of grouped data.
- A: \bar{x}=\dfrac{\sum f_ix_i}{\sum f_i}, where x_i are class marks.
- Q: What is the class mark of a class interval?
- A: \dfrac{\text{lower limit}+\text{upper limit}}{2}.
- Q: Write the assumed-mean formula for the mean.
- A: \bar{x}=a+\dfrac{\sum f_id_i}{\sum f_i}, where d_i=x_i-a and a is the assumed mean.
- Q: Write the mode formula for grouped data.
- A: \text{Mode}=l+\dfrac{f_1-f_0}{2f_1-f_0-f_2}\times h.
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