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NDA 2025
Exam
NDA
Year
2025
Subject
Mathematics
Chapter
Statistics

NDA 2025 · Mathematics · Statistics

Consider the following for the four (04) items that follow: The...

Consider the following for the four (04) items that follow:
The frequency distribution of height of students of a class is given below:
Height (in cm)Number of Students
160–16212
162–16415
164–16624
166–16813

The height which occurs most frequently in the class is

Options

  1. A163.5163.5 cm
  2. B163.9163.9 cm
  3. C164.5164.5 cm
  4. D164.9164.9 cm

Correct answer

D. 164.9164.9 cm

Step-by-step solution

The height which occurs most frequently corresponds to the mode of the given frequency distribution.

The maximum frequency is 2424, which corresponds to the class interval 164−166164-166. Thus, the modal class is 164−166164-166.

The lower limit of the modal class, l=164l = 164
Frequency of the modal class, f1=24f_1 = 24
Frequency of the class preceding the modal class, f0=15f_0 = 15
Frequency of the class succeeding the modal class, f2=13f_2 = 13
Class size, h=2h = 2

The mode is calculated using the formula:
Mode=l+(f1−f02f1−f0−f2)×h\text{Mode} = l + \left( \dfrac{f_1 - f_0}{2f_1 - f_0 - f_2} \right) \times h

Substituting the values:
Mode=164+(24−152(24)−15−13)×2\text{Mode} = 164 + \left( \dfrac{24 - 15}{2(24) - 15 - 13} \right) \times 2

Mode=164+(948−28)×2\text{Mode} = 164 + \left( \dfrac{9}{48 - 28} \right) \times 2

Mode=164+(920)×2\text{Mode} = 164 + \left( \dfrac{9}{20} \right) \times 2

Mode=164+910=164+0.9=164.9\text{Mode} = 164 + \dfrac{9}{10} = 164 + 0.9 = 164.9

The height which occurs most frequently is 164.9164.9 cm.

Answer: 164.9164.9 cm
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