The standard deviation of first 10 multiples of 4 is
Topic: JEE PYQ
Answer: C. Full step-by-step solution below.
A7
B8
C11.5
D14
Correct answer: C
Solution
(c) Here, first to multiple of 4 are 4,8,12…………36,40. now X=104+8+12+……..+40=22 Deviation of each from x is D1=4−22=−18D2=8−22=−14D3=12−22=−10 σ=NϵD2=10(−18)2+(−14)2+(−10)2+………+(10)2=11.5