MCQs

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Overall MCQs for Reference

What is the mean in data science?
a. The greatest value in a dataset
b. The lowest value in a dataset
c. The average value of a dataset
d. The difference between maximum and minimum value
Answer: c.geeksforgeeks+2
The arithmetic mean of numbers 2, 4, 6 is:
a. 4
b. 5
c. 6
d. 3
Answer: a.geeksforgeeks+1
Which formula correctly computes the mean for a dataset?
a. Mean = (Sum of values) / (Number of values)
b. Mean = (Maximum value) × (Minimum value)
c. Mean = (Sum of values) – (Number of values)
d. Mean = (Median + Mode) / 2
Answer: a.statistics.laerd+1
The mean of the set {10, 20, 30} is:
a. 10
b. 20
c. 30
d. 15
Answer: b.scribbr+1
How is the mean affected by extreme values (outliers)?
a. Strongly affected
b. Not affected
c. Slightly affected
d. Never affected
Answer: a.excelr+1
What type of mean is commonly used with grouped data?
a. Arithmetic mean
b. Geometric mean
c. Harmonic mean
d. Root mean
Answer: a.orchidsinternationalschool+1
Which measure of central tendency uses all data points in its calculation?
a. Mode
b. Median
c. Mean
d. None
Answer: c.byjus+1
The mean is most appropriate when data is:
a. Skewed
b. Symmetrical
c. Categorical
d. Binary
Answer: b.geeksforgeeks+1
In data science, mean is important for:
a. Data summarization
b. Data encryption
c. Data labeling
d. Feature extraction only
Answer: a.cuemath+1
What does the mean represent in a data set?
a. Center
b. Spread
c. Range
d. Frequency
Answer: a.wikipedia+1
The geometric mean is best used for:
a. Additive data
b. Multiplicative data
c. Categorical data
d. Binary data
Answer: b.orchidsinternationalschool+1
If the mean income is higher than the median, the distribution is likely:
a. Symmetrical
b. Right-skewed
c. Left-skewed
d. Uniform
Answer: b.excelr+1
Mean is also called:
a. Median
b. Average
c. Mode
d. Frequency
Answer: b.corporatefinanceinstitute+1
Which of the following is NOT a type of mean?
a. Arithmetic mean
b. Geometric mean
c. Harmonic mean
d. Quantile mean
Answer: d.cuemath+1
For data {5, 8, 12}, what is the mean?
a. 8.33
b. 10
c. 5
d. 12
Answer: a.byjus+1
For sample mean, the notation often used is:
a. μ
b. x̄
c. λ
d. α
Answer: b.khanacademy+1
The formula for mean in grouped data is:
a. Σ(f × x) / Σf
b. Σx / n
c. Mode
d. Range
Answer: a.orchidsinternationalschool+1
Why is mean important in predictive modeling?
a. Reduces dimensionality
b. Summarizes the central tendency
c. Decides accuracy
d. Creates outliers
Answer: b.cuemath+1
The mean minimizes:
a. Sum of squared deviations
b. Count of modes
c. Median values
d. Frequency
Answer: a.statistics.laerd+1
The mean is calculated for which type of data?
a. Qualitative only
b. Quantitative only
c. Both
d. Neither
Answer: b.wikipedia+1
When all data values are equal, mean, median and mode are:
a. Different
b. Equal
c. Unrelated
d. Reversed
Answer: b.khanacademy+1
A data set {2, 4, 10, 20} has a mean of:
a. 9
b. 10
c. 12
d. 18
Answer: b.scribbr+1
The mean is used in which of these descriptive statistics?
a. Standard deviation
b. Range
c. Percentile
d. Frequency
Answer: a.geeksforgeeks+1
In python, how do you find the mean using numpy?
a. np.mean(array)
b. np.median(array)
c. np.average(array)
d. sum(array)
Answer: a.w3schools
Which statement about mean is FALSE?
a. It is sensitive to outliers
b. Requires numerical data
c. Uses all data points
d. Is the same as mode
Answer: d.statistics.laerd+1
The harmonic mean is least used for which type?
a. Average rates
b. Multiplicative processes
c. Ordinal data
d. Speed calculations
Answer: c.orchidsinternationalschool+1
What is the main disadvantage of mean?
a. Ignores outliers
b. Sensitive to outliers
c. Ignores data variation
d. Ignores frequency
Answer: b.excelr+1
For frequency data, mean can be calculated as:
a. Σ(f × x) / Σf
b. Σf / Σx
c. Frequency / class interval
d. Mode × frequency
Answer: a.byjus+1
In data science, mean is used to:
a. Normalize data
b. Create random forests
c. Build neural networks directly
d. Encrypt values
Answer: a.simplilearn+1
Population mean is usually denoted by:
a. μ
b. x̄
c. Σf
d. n
Answer: a.khanacademy+1
The arithmetic mean is appropriate for:
a. Symmetrical data
b. Skewed data
c. Nominal data
d. None
Answer: a.statistics.laerd+1
When mean is lower than median, the distribution is:
a. Right-skewed
b. Left-skewed
c. Symmetrical
d. Uniform
Answer: b.geeksforgeeks+1
Which of these is a limitation of mean?
a. Insensitive to data spread
b. Sensitive to frequency
c. Sensitive to outliers
d. Cannot be used for quantitative data
Answer: c.khanacademy+1
In SQL, the mean can be computed using:
a. AVG()
b. MEAN()
c. SUM()
d. COUNT()
Answer: a.cuemath
The mean acts as a model for:
a. Predicting a typical value
b. Maximizing spread
c. Finding ranges
d. Minimizing frequency
Answer: a.wikipedia+1
The mean can be used with:
a. Discrete data
b. Continuous data
c. Both
d. Neither
Answer: c.byjus+1
The mean helps in:
a. Data summarization
b. Feature scaling
c. Measuring spread
d. Multiplying values
Answer: a.simplilearn+1
To calculate the mean for the data {1, 2, 3, 4, 5}, sum = 15, n = 5, so mean is:
a. 5
b. 4
c. 3
d. 2
Answer: c.geeksforgeeks+1
If all values are identical, the mean will be:
a. The same as data value
b. Highest value
c. Lowest value
d. Unaffected
Answer: a.khanacademy+1
What is the effect of adding a constant to each data value?
a. Mean increases by the constant
b. Mean decreases
c. Mean is unchanged
d. Mean changes randomly
Answer: a.scribbr+1
The mean is typically NOT used for:
a. Categorical data
b. Continuous data
c. Numerical data
d. Ratio data
Answer: a.statistics.laerd+1
Which type of mean fits calculating average speed:
a. Arithmetic mean
b. Harmonic mean
c. Geometric mean
d. Mode
Answer: b.orchidsinternationalschool+1
For large datasets, mean provides:
a. A summarized value
b. Spread measurement
c. Categorical analysis
d. Frequency report
Answer: a.wikipedia+1
If a dataset has values: {5, 9, 15}, n = 3, mean is:
a. 10
b. 9.66
c. 7.66
d. 8
Answer: b.scribbr+1
Mean calculation for weighted data uses:
a. Weighted mean formula
b. Geometric mean formula
c. Mode
d. Median
Answer: a.cuemath+1
The mean fails as a central measure when data is:
a. Symmetrical
b. Highly skewed
c. Normally distributed
d. Uniform
Answer: b.geeksforgeeks+1
Mean takes into account:
a. All data values
b. Only the maximum
c. Only the minimum
d. Only frequency
Answer: a.simplilearn+1
For a dataset with large outliers, mean:
a. May not represent typical value
b. Accurately represents center
c. Always equals median
d. Is unaffected
Answer: a.excelr+1
Calculating the mean involves:
a. Addition and Division
b. Multiplication and Subtraction
c. Logarithms only
d. Frequency comparison
Answer: a.byjus+1
Mean is a common measure of:
a. Central tendency
b. Data dispersion
c. Frequency
d. Data transformation
Answer: a.simplilearn+1

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