Mathematics ยท 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

In a data set {1, 2, 3, 4, 5}, what is the mean?

  1. 2

  2. 3

  3. 4

  4. 5
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mean is the sum of all values divided by the number of values in a dataset. In this case, (1+2+3+4+5) / 5 = 3.

Multiple choice

In a data set {1, 2, 3, 4, 5}, what is the median?

  1. 2

  2. 3

  3. 4

  4. 5
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Median is the middle value of a dataset when assorted in numerical order. In this case, the values can be assorted as {1, 2, 3, 4, 5} and the middle value is 3.

Multiple choice

In a data set {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, what is the mean?

  1. 5

  2. 5.5

  3. 6

  4. 6.5
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mean is the sum of all values divided by the number of values in a dataset. In this case, (1+2+3+4+5+6+7+8+9+10) / 10 = 55 / 10 = 5.5.

Multiple choice

In a data set {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, what is the median?

  1. 5

  2. 5.5

  3. 6

  4. 6.5
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Median is the middle value of a dataset when assorted in numerical order. In this case, the values can be assorted as {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} and the middle value is 5.5.

Multiple choice

In epidemiology, what is the basic reproduction number denoted by?

  1. $R_0$
  2. $R_1$
  3. $R_2$
  4. $R_3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$R_0$ represents the basic reproduction number in epidemiology, which is the average number of secondary infections caused by a single infected individual in a completely susceptible population.