Elementary Statistics MCQ Quiz - Objective Question with Answer for Elementary Statistics - Download Free PDF
Last updated on Jul 9, 2025
Latest Elementary Statistics MCQ Objective Questions
Elementary Statistics Question 1:
What is the mean of the following distribution?
Marks | 19 | 36 | 60 | 69 | 85 |
No. of students | 63 | 62 | 59 | 17 | 70 |
Answer (Detailed Solution Below)
Elementary Statistics Question 1 Detailed Solution
Given:
Marks = [19, 36, 60, 69, 85]
No. of Students = [63, 62, 59, 17, 70]
Formula Used:
Mean = (Σ(fi × xi)) / Σ(fi)
Where:
fi = Frequency (No. of Students)
xi = Marks
Calculation:
fi × xi:
19 × 63 = 1197
36 × 62 = 2232
60 × 59 = 3540
69 × 17 = 1173
85 × 70 = 5950
Σ(fi × xi) = 1197 + 2232 + 3540 + 1173 + 5950 = 14092
Σ(fi) = 63 + 62 + 59 + 17 + 70 = 271
Mean:
⇒ Mean = Σ(fi × xi) / Σ(fi)
⇒ Mean = 14092 / 271
⇒ Mean = 52
The mean of the distribution is 52.
Elementary Statistics Question 2:
Following are the marks obtained by 5 students in a test: 45, 67, 80, 56 and 72. What is the range of the marks?
Answer (Detailed Solution Below)
Elementary Statistics Question 2 Detailed Solution
Given:
Marks obtained by students: 45, 67, 80, 56, 72
Formula Used:
Range = Highest value - Lowest value
Calculation:
Highest value = 80
Lowest value = 45
⇒ Range = 80 - 45
⇒ Range = 35
The range of the marks is 35.
Elementary Statistics Question 3:
Marks in statistics of 12 students are x, 28, 35, 56, 78, 63, 65, 81, 79, 83, 80, y, where x and y are the lowest and highest marks, respectively. If the range and average of the marks are 70 and 64, respectively, then the ordered pair (x, y) is:
Answer (Detailed Solution Below)
Elementary Statistics Question 3 Detailed Solution
Given:
Marks of 12 students: x, 28, 35, 56, 78, 63, 65, 81, 79, 83, 80, y
Range = 70
Average = 64
x = Lowest mark, y = Highest mark
Formula used:
Range = y - x
Average =
Calculation:
Range = y - x
⇒ 70 = y - x
⇒ y = x + 70
Average =
⇒ 64 =
⇒ 64 × 12 = x + 28 + 35 + 56 + 78 + 63 + 65 + 81 + 79 + 83 + 80 + y
⇒ 768 = x + y + (28 + 35 + 56 + 78 + 63 + 65 + 81 + 79 + 83 + 80)
⇒ 768 = x + y + 648
⇒ x + y = 768 - 648
⇒ x + y = 120
Solving for x and y:
From y = x + 70 and x + y = 120, substitute y = x + 70:
⇒ x + (x + 70) = 120
⇒ 2x + 70 = 120
⇒ 2x = 120 - 70
⇒ 2x = 50
⇒ x = 25
Substitute x = 25 in y = x + 70:
⇒ y = 25 + 70
⇒ y = 95
∴ The ordered pair (x, y) = (25, 95).
The correct answer is option (3).
Elementary Statistics Question 4:
If the mode of the following data is 140, then what is the value of x?
Class | 125-130 | 130-135 | 135-140 | 140-145 | 145-150 |
---|---|---|---|---|---|
Frequency | 30 | 30 | 33 | x | 31 |
Answer (Detailed Solution Below)
Elementary Statistics Question 4 Detailed Solution
Given:
Classes: 125–130(30), 130–135(30), 135–140(33), 140–145(x), 145–150(31)
Formula used:
Where: Modal class = one containing the mode (140–145):
l = 140, f1 = x, f0 = 33, f2 = 31, h = 5
Calculations:
Mode = 140, so
⇒
⇒ 5x - 165 = 0
⇒ x = 165/5
⇒ x = 33
∴ The correct answer is option 1.
Elementary Statistics Question 5:
The mode and median of a data set is 28.4 and 88, respectively. What is the mean of the data set? (Use empirical formula.)
Answer (Detailed Solution Below)
Elementary Statistics Question 5 Detailed Solution
Given:
Mode = 28.4
Median = 88
Formula used:
Or,
Calculation:
Using formula:
⇒ Mean - 28.4 = 3Mean - 264
⇒ -28.4 + 264 = 3Mean - Mean
⇒ 235.6 = 2Mean
⇒ Mean = 117.8
∴ The correct answer is
Top Elementary Statistics MCQ Objective Questions
If Mode is 8 and mean – median = 12 then find the value of mean?
Answer (Detailed Solution Below)
Elementary Statistics Question 6 Detailed Solution
Download Solution PDFGiven:
If mode = 8 and mean – median = 12
Formula used
Mode = mean – 3 (mean - median)
Mode = 3median - 2mean
Calculation
We know that, Mode = mean – 3(mean -median)
Put the value, 8 = mean – 3 (12)
Mean = 36 + 8 = 44
What is the Mode of the following data:
X |
32 |
14 |
59 |
41 |
28 |
7 |
34 |
20 |
f(x) |
8 |
4 |
12 |
8 |
10 |
16 |
15 |
9 |
Answer (Detailed Solution Below)
Elementary Statistics Question 7 Detailed Solution
Download Solution PDFConcept:
The mode is the value that appears most often in a set of data values.
Calculation:
32 occurred 8 times
14 occurred 4 times
59 occurred 12 times
41 occurred 8 times
28 occurred 10 times
7 occurred 16 times
34 occurred 15 times
20 occurred 9 times
∴ Mode will be 7
If the difference between the mode and median is 2, then find the difference between the median and mean(in the given order).
Answer (Detailed Solution Below)
Elementary Statistics Question 8 Detailed Solution
Download Solution PDFConcept:
Relation between mode, median and mean is given by:
Mode = 3 × median – 2 × mean
Calculation:
Given:
Mode – median = 2
As we know
Mode = 3 × median – 2 × mean
Now, Mode = median + 2
⇒ (2 + median) = 3median – 2mean
⇒ 2Median - 2Mean = 2
⇒ Median - Mean = 1
∴ The difference between the median and mean is 1.Find the variance of the given numbers: 36, 28, 45, and 51.
Answer (Detailed Solution Below)
Elementary Statistics Question 9 Detailed Solution
Download Solution PDFMean is the average of the given numbers,
⇒ Mean = (36 + 28 + 45 + 51)/4 = 160/4 = 40
Variance is calculated by taking the average of the squares of the difference between each term and the mean,
⇒ Variance = [(36 - 40)2 + (28 - 40)2 + (45 - 40)2 + (51 - 40)2]/4
= [16 + 144 + 25 + 121]/4 = 306/4 = 76.5
∴ Variance of the given numbers = 76.5
The mean deviation of the data 3, 10, 10, 4, 7, 10, 5 from mean is :
Answer (Detailed Solution Below)
Elementary Statistics Question 10 Detailed Solution
Download Solution PDFGiven:
Data is 3, 10, 10, 4, 7, 10, 5
Formula used:
Average deviation about the mean
xi = individual term
n = total number of terms
Mean = Sum of all the terms/Total number of terms
Calculation:
n = total numbers in a data = 7
Mean x̅ = (3 + 10 + 10 + 4 + 7 + 10 + 5)/7 = 7
Mean deviation from mean =
Mean deviation from mean = (1/7) × [4 + 3 + 3 + 3 + 0 + 3 + 2]
∴ Mean deviation = 18/7
Mean of five consecutive even numbers is 16, find the variance of the numbers.
Answer (Detailed Solution Below)
Elementary Statistics Question 11 Detailed Solution
Download Solution PDFGiven:
Mean of five consecutive even numbers = 16
Formula used:
V = variance
∑ = summation
x = observation
n = number of observations
a = 1st term of the numbers
d = common difference
Calculation:
⇒ 2a + (5 – 1)2 = 32
⇒ 2a + 4 × 2 = 32
⇒ 2a = 32 – 8
⇒ 2a = 24
⇒ a = 12
1st term = 12
Other terms are 14, 16, 18, 20
⇒
⇒
⇒ 8
⇒ V = 8
∴ The variance of the numbers is 8
Find the mean deviation of 3, 4, 5, 7, 10, 10, 10
Answer (Detailed Solution Below)
Elementary Statistics Question 12 Detailed Solution
Download Solution PDFGiven
3, 4, 5, 7, 10, 10, 10
Concept used
Mean = Average
Deviation is the difference with the given number in the series.
Calculation
Mean =
Mean = 49/7
Mean = 7
Checking the mean deviation with all the numbers given in the series.
Mean deviation
⇒ |7 - 3|, |7 - 4|, |7 - 5|, |7 - 7|, |7 - 10|, |7 - 10|, |7 - 10|
⇒ 4, 3, 2, 0, 3, 3, 3
Mean deviation =
Mean deviation = 18/7
In a frequency distribution, the mid value of a class is 12 and its width is 6. The lower limit of the class is:
Answer (Detailed Solution Below)
Elementary Statistics Question 13 Detailed Solution
Download Solution PDFGiven:
The mid value of a class = 12
Width = 6
Formula used:
Lower limit = Mid value – width/2
Calculation:
Lower limit = 12 – 6/2
⇒ 12 – 3
⇒ 9
∴ The lower limit of the class is 9
The standard deviation of a data set is given as 34. What will be the variance of the data set?
Answer (Detailed Solution Below)
Elementary Statistics Question 14 Detailed Solution
Download Solution PDFGIVEN :
The standard deviation of a data set is given as 34.
CONCEPT :
The value of variance is the square of standard deviation.
FORMULA USED :
Standard Deviation = √Variance
CALCULATION :
Using the formula :
Variance of the set of data = 342 = 1156
Find the standard deviation of {7, 13, 15, 11, 4}
Answer (Detailed Solution Below)
Elementary Statistics Question 15 Detailed Solution
Download Solution PDFGiven:
7, 13, 15, 11, 4
Formula used:
Mean (m) = Total of observations/number of observations
S.D = standard deviation
∑ = summation
x = observation
m = mean of the observations
n = number of observation
Calculation:
Mean of 7, 13, 15, 11, 4
⇒ 50/5
⇒ 10
⇒
⇒
⇒ √16
⇒ 4
∴ The standard deviation is 4