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NDA 2020
Exam
NDA
Year
2020
Subject
Mathematics
Chapter
Statistics

NDA 2020 · Mathematics · Statistics

Paragraph: Read the following information and answer: Consider the...

Paragraph: Read the following information and answer: Consider the following statements : 1. Modal value of the marks in Physics lies in the interval 30−4030-40. 2. Median of the marks in Physics is less than that of marks in Mathematics. Which of the above statements is/are correct?

Options

  1. A1 only
  2. B2 only
  3. CBoth 1 and 2
  4. DNeither 1 nor 2

Correct answer

A. 1 only

Step-by-step solution

(1) Modal value of the marks of Physics is the interval in which maximum number of students got his marks. In the marks interval of ( 30−40)30-40), number of students in Physics is 30 , which is largest number of students in any interval. Hence, modal values of marks in Physics is (30-40). Statement (1) is correct. (2) Median class is given by (N2)th \left(\frac{N}{2}\right)^{\text{th }} item i.e. \left(\frac{100}{2}\right)^{\text{th }}itemwhichis50thitem.Thiscorrespondstotheclassintervalofitem which is 50th item. This corresponds to the class interval of(40-50)forPhysicsandfor Physics and(30-40)forMathematics.for Mathematics. Medium =l1+N2−C.f.f×i∴ Median for Physics =40+1002−4926×10\begin{aligned} & \text{ Medium }=l_1+\frac{\frac{N}{2}-C . f .}{f} \times i \\ & \therefore \text{ Median for Physics }=40+\frac{\frac{100}{2}-49}{26} \times 10\end{aligned}$\begin{aligned} & =40+\frac{50-49}{26} \times 10=40.385 \\ & \text{Median for Maths }=30+\frac{\frac{100}{2}-31}{38} \times 10 \\ & =30+\frac{50-31}{38} \times 10=35\end{aligned} Thus, median of the marks in Physics is more than median of the marks in Mathematics. Hence, statement (2) is not correct.
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