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NDA 2026 — Mathematics PYQ

NDA | Mathematics | 2026

the frequency distribution of marks obtained by 100 students in a certain subject is given below:

Marks	0-10	10-20	20-30	30-40
No. of students	10	20	$f$	40

What is the mean deviation about the arithmetic mean?

किसी विषय में 100 छात्रों द्वारा प्राप्तांकों का बारंबारता बंटन नीचे दिया गया है :

अंक	0-10	10-20	20-30	30-40
छात्रों की संख्या	10	20	$f$	40

समांतर माध्य के प्रति माध्य विचलन क्या है ?

Marks	Frequency (fi)	Midpoint (xi)	fi⋅xi
0-10	$10$	$5$	$50$
10-20	$20$	$15$	$300$
20-30	$30$	$25$	$750$
30-40	$40$	$35$	$1400$

Marks	Frequency (fi)	Midpoint (xi)	fi⋅xi
0-10	$10$	$5$	$50$
10-20	$20$	$15$	$300$
20-30	$30$	$25$	$750$
30-40	$40$	$35$	$1400$

NDA 2026 — Mathematics PYQ

Choose the correct answer:

Explanation

Explanation