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Question

Find the mean of the range and the mode of the given data.
4, 6, 11, 17, 18, 3, 11, 21, 5, 11

This question was previously asked in
RRB ALP 2018 CBT 2 Fitter Question Paper (21-Jan-2019) (Shift 3)
The correct answer is
14.5

Data Set Statistics Calculation

This guide explains how to compute the mean of the range and the mode using the provided data set.

Given Data

The data set provided is: 4, 6, 11, 17, 18, 3, 11, 21, 5, 11.

1. Range Calculation

To find the range, we first need the minimum and maximum values. Let's sort the data:

Sorted Data: 3, 4, 5, 6, 11, 11, 11, 17, 18, 21.

Minimum Value = 3

Maximum Value = 21

The range is calculated as:

\(Range = Maximum Value - Minimum Value\)

\(Range = 21 - 3 = 18\)

2. Mode Identification

The mode is the number that appears most often in the data set.

Observing the sorted data (3, 4, 5, 6, 11, 11, 11, 17, 18, 21), the number 11 occurs 3 times, more than any other number.

Mode = 11

3. Mean of Range and Mode Calculation

The final step is to calculate the mean of the range (18) and the mode (11).

Mean is calculated by summing the values and dividing by the count of values (which is 2 in this case).

\(Mean = (Value1 + Value2) / 2\)

\(Mean \ of \ Range \ and \ Mode = \frac{18 + 11}{2}\)

\(Mean \ of \ Range \ and \ Mode = \frac{29}{2}\)

\(Mean \ of \ Range \ and \ Mode = 14.5\)

Conclusion

The computed mean of the range and mode for the given data set is 14.5.

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Important Questions from Elementary Statistics

  1. What is the mode of the given data?

    3, 0, 1, 0, 2, 1, 2, 0, 1, 2, 1, 1, 1, 3, 2
  2. What is the mode of the given data?

    21, 22, 23, 23, 24, 21, 22, 23, 21, 23, 24, 23, 21, 23
  3. A bowler has taken 0, 3, 2, 1, 5, 3, 4, 5, 5, 2, 2, 0, 0, 1 and 2 wickets in 15 consecutive matches. What is the mode of the given data?

  4. The data given below shows the number of people who have saved a certain amount of money.

    Saving (In Rs.)

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    What is the median of the given data?

  5. If the ratio of mean and median of a certain data is 4 : 5, then find the ratio of its mean and mode.

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