Mathematics · Quantitative Aptitude

Statistics and Dispersion

515 Questions

Statistics and dispersion involve the calculation of mean, standard deviation, variance, and coefficient of variation for data sets. These questions also cover probability distributions and cumulative frequency analysis. Such quantitative aptitude topics are heavily featured in banking and SSC examinations.

Standard deviationNormal distributionMean calculationCumulative frequencyCoefficient of variation

Statistics and Dispersion Questions

Multiple choice

Directions: Following is the table for the results of the heights of some plants which were grown in laboratory and recorded after 30 days (in mm) ||| |---|---| | Height (in mm) | Frequency | | 200 - 210 | 2 | | 210 - 220 | 3 | | 220 - 230 | 1 | | 230 -240 | 5 | | 240 - 250 | 7 |

What is the cumulative frequency for the second class interval?

  1. 2

  2. 3

  3. 5

  4. 6
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cumulative frequency for the second class interval = 2 + 3 = 5.

Multiple choice

Directions: Following is the table for the results of the heights of some plants which were grown in laboratory and recorded after 30 days (in mm) ||| |---|---| | Height (in mm) | Frequency | | 200 - 210 | 2 | | 210 - 220 | 3 | | 220 - 230 | 1 | | 230 - 240 | 5 | | 240- 250 | 7 |

What is the cumulative frequency for the third class interval?

  1. 6

  2. 7

  3. 8

  4. 9
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cumulative frequency for the third class interval = 2 + 3 + 1 = 6.

Multiple choice

Find the median of given data. 18, 24, 8, 9, 6

  1. 6

  2. 9

  3. 10

  4. 12
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The median is the middle value when data is arranged in order. Sorted values: 6, 8, 9, 18, 24. With 5 values, the median is the 3rd value, which is 9.