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JKCET Statistics and Probability — practice questions — page 3

Explore 70 free Statistics and Probability questions in JKCET Mathematics. Open each question or exercise to read its content, reference answers and available explanation.

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Statistics and Probability questions and exercises with answers

Showing questions 61–70 of 70.

Order the steps: compute a standard deviationRead the answer and worked solution →Flip and pair: symbol with meaningRead the answer and worked solution →Grouped data or ungrouped data?Read the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Tap every statement true of the rangeRead the answer and worked solution →Complete the reason absolute values appearRead the answer and worked solution →Central value choicesRead the answer and worked solution →Assertion and reason: choosing a measureRead the answer and worked solution →True or false: measures comparedRead the answer and worked solution →Match each idea to what it answersRead the answer and worked solution →

Worked practice questions

Order the steps: compute a standard deviation

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Steps
  1. Compute the mean of the observations
  2. Find each observation's deviation from the mean
  3. Square every deviation
  4. Average the squares to get the variance
  5. Take the square root to get the standard deviation
Variance first, square root last. Source: syllabus Maths, Ch 13 Statistics.

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Flip and pair: symbol with meaning

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Matching pairs
  1. A
    σ
    B
    standard deviation
  2. A
    σ²
    B
    variance
  3. A
    M.D.(x̄)
    B
    mean deviation about the mean
  4. A
    M.D.(M)
    B
    mean deviation about the median
  5. A
    n
    B
    number of observations
  6. A
    N = Σfᵢ
    B
    total frequency in grouped data
The notation used through the chapter. Source: syllabus Maths, Ch 13 Statistics.

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Grouped data or ungrouped data?

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Items
  1. Item
    Divide by n, the count of observations
    Category
    Ungrouped data
  2. Item
    Each observation is listed individually
    Category
    Ungrouped data
  3. Item
    Divide by N, the total frequency
    Category
    Grouped data
  4. Item
    Each value carries a frequency fᵢ
    Category
    Grouped data
Categories
  1. Item
    Ungrouped data
  2. Item
    Grouped data
Grouped data brings frequencies in, and the totals change accordingly. Source: syllabus Maths, Ch 13 Statistics.

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