Mathematics · Quantitative Aptitude

Statistics and Dispersion

559 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

Which of the following is/are a mathematical average?

Median
Quartiles
Mode
Geometric mean
Deciles

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Multiple choice

Which of the following is/are called ratio average(s)?

GM
AM
AM and GM
AM and HM
GM and HM

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Multiple choice

If all observations of a distribution are increased by 10, then the standard deviatiobn of the series will be

increased by 10
decreased by 10
increased by 20
increased by 5
unchanged

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Multiple choice

The sum of deviations of a set of observations is zero when the deviations are taken from their

arithmetic mean
median
mode
geometric mean
harmonic mean

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Multiple choice

The mean and standard deviation of 10 observations are 45 and 3, respectively. If each observation is increased by 4, the respective changed mean and standard deviation will be

45 and 3
41 and 3
49 and 3
45 and 7
49 and 7

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Multiple choice

The standard deviation of which of the following pairs of numbers is the highest?

10, 20
100, 300
80, 100
750, 800
1000, 1100

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Multiple choice

Quartile deviation is _______ inter-quartile range.

half of
double of
triple of
equal to
one-third of

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Multiple choice

The difference between the upper boundary and the lower boundary of a class is called

mid value
class limit
class mark
class size
class frequency

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Multiple choice

When the data is classified in respect of successive time points, it is known as

chronological data
geographical data
cardinal data
ordinal data
None of these

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Multiple choice

Mid values of a class are called

upper limit
lower limit
class mark
median
class interval

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Multiple choice

When one end of a class is not specified, the class is called

empty class
modal class
open-ended class
close-ended class
class frequency

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Multiple choice

Find the average of the first 200 natural numbers.

200.5
101
10.05
100.5
None of these

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Multiple choice

Among 12 numbers, average of the first 4 numbers is 25, average of the next 4 numbers is 30 and average of the last 4 numbers is 35. What is the average of all 12 numbers?

30
7.5
22.5
90
None of these

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Multiple choice

If the average of 6 cosecutive odd numbers is m , then what will be the average of the next 6 consecutive odd numbers?

Cannot be determined
m + 6
m + 12
m + 2
None of these

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Multiple choice

Find the average of the first 100 even natural numbers.

101
50.5
100
102
None of these

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