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RRB NTPC Elementary Statistics — practice questions — page 2

Explore 58 free Elementary Statistics questions in RRB NTPC Mathematics. Open each question or exercise to read its content, reference answers and available explanation.

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Elementary Statistics questions and exercises with answers

Showing questions 31–58 of 58.

Which average can describe the most common shirt colour in a survey?Read the answer and worked solution →Which average can be found for ranked grades from F to A, not numbers?Read the answer and worked solution →Which statistic decides the winner when a plurality wins an election?Read the answer and worked solution →A bar chart is mainly used to display which kind of data?Read the answer and worked solution →A vertical bar chart is also called a?Read the answer and worked solution →Bar charts arranged from highest to lowest are called?Read the answer and worked solution →In a grouped bar chart, each category has how many bars?Read the answer and worked solution →In a stacked bar chart, the total height of a stack shows?Read the answer and worked solution →Where should the bars of a bar chart normally begin?Read the answer and worked solution →Another name for a stacked bar chart is a?Read the answer and worked solution →In a column chart, the categories appear along which axis?Read the answer and worked solution →Which word is a synonym for statistical dispersion?Read the answer and worked solution →Dispersion is contrasted with which property of a distribution?Read the answer and worked solution →Pearson's rule for slightly skewed data gives the median approximately as?Read the answer and worked solution →For slightly skewed data the mean is 30 and the mode is 24. Estimate the median.Read the answer and worked solution →A mildly skewed set has mean 22 and median 20. Estimate its mode.Read the answer and worked solution →One value 37 in a set of 12 with mean 25 is replaced by 13. New mean?Read the answer and worked solution →Per capita income is an example of which measure?Read the answer and worked solution →In an ordered list of 11 values, the median is which value?Read the answer and worked solution →Shoe sizes: size 6 (2 pupils), 7 (5 pupils), 8 (3 pupils). What is the modal size?Read the answer and worked solution →Why is the median preferred for skewed incomes?Read the answer and worked solution →How many modes does the data 1, 1, 2, 4, 4 have?Read the answer and worked solution →The data 5, 7, 9, 11, 13 are in arithmetic progression. Their median is?Read the answer and worked solution →How is the median of 8 ordered values found?Read the answer and worked solution →A fair coin is tossed ten times. The chance of ten heads in a row is aboutRead the answer and worked solution →A fair coin lands tails five times in a row. The chance of tails on the next toss isRead the answer and worked solution →RRB NTPC · Calculate Mean of DataRead the answer and worked solution →RRB NTPC · Central Tendency MeasuresRead the answer and worked solution →

Worked practice questions

Which average can describe the most common shirt colour in a survey?

  1. Range
  2. Mode
  3. Median
  4. Mean
Show answer and solution

Correct answer: B. Mode

Colours are not numbers, and only the mode, the most frequent value, applies to such data.

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Which average can be found for ranked grades from F to A, not numbers?

  1. Variance
  2. Mean
  3. Range
  4. Median
Show answer and solution

Correct answer: D. Median

The median needs only an ordering of the values, so ranked grades are enough.

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Which statistic decides the winner when a plurality wins an election?

  1. Range
  2. Median
  3. Mean
  4. Mode
Show answer and solution

Correct answer: D. Mode

The candidate with the most votes is the most frequent value, which is the mode.

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