Online Test — Statistics
10 Questions • 15 min • Chapter MCQ
15:00
Question 1 of 10
medium
For grouped data, the class mark (midpoint) of class 20-30 is:
20
25
30
35
Explanation: (20+30)/2 = 50/2 = 25
Question 2 of 10
medium
The median class is the class where cumulative frequency is:
Equal to N
Greater than N/2
Less than N/2
Equal to N/2
Explanation: Median class = first class with cf ≥ N/2
Question 3 of 10
medium
In the empirical relation, Mode = 3 Median − 2 Mean. If Mean=25, Median=26, then Mode is:
24
25
26
28
Explanation: 3×26 − 2×25 = 78 − 50 = 28
Question 4 of 10
medium
A histogram has bars that:
Have gaps
Touch each other
Are always equal width
Are always equal height
Explanation: Histograms have touching bars (continuous data)
Question 5 of 10
medium
The modal class is the class with:
Lowest frequency
Highest frequency
Middle frequency
Zero frequency
Explanation: Modal class = highest frequency class
Question 6 of 10
medium
In a less than ogive, we plot:
Lower limit vs cf
Upper limit vs cf
Midpoint vs cf
Frequency vs cf
Explanation: Less than ogive: upper limit vs less than cumulative frequency
Question 7 of 10
medium
Find the mean for: Class 0-10(f=2),10-20(f=3),20-30(f=5)
15
17
18
19
Explanation: Midpoints:5,15,25; Σf=10, Σfx=2×5+3×15+5×25=10+45+125=180; Mean=18
Question 8 of 10
medium
The intersection point of less than and greater than ogives gives:
Mean
Median
Mode
Range
Explanation: The x-coordinate of intersection is the median
Question 9 of 10
medium
A frequency polygon is drawn by joining points at:
Class boundaries
Class midpoints
Upper limits
Lower limits
Explanation: Frequency polygon uses class midpoints
Question 10 of 10
medium
For data: 0-10(3),10-20(7),20-30(10),30-40(5), the median class is:
0-10
10-20
20-30
30-40
Explanation: N=25, N/2=12.5; cf:3,10,20 → 20≥12.5 → median class 20-30