Day 125: NDA Maths

5 questions (7 parts). Try each one first, then open its answer.

Question 1
Statistics. Asked once: NDA 2 2019 (same type asked 3 times)
119 $v$
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Question 2
Vectors. Asked once: NDA 1 2021 (same type asked 3 times)
71 $\vec{r} = a\hat{i} + b\hat{j}$
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Question 3
Conics. Asked once: NDA 1 2019 (same type asked 3 times)
54 $2x^2-3y^2-6=0$
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Question 4 (case study, 3 parts)
Statistics. Asked once: NDA 1 2022 (same type asked 3 times)
Consider the following for the next three (03) items that follow: The algebraic sum of the deviations of a set of values $x_1, x_2, x_3, \ldots, x_n$ measured from 100 is $-20$ and the algebraic sum of the deviations of the same set of values measured from 92 is 140.
106 $What is the mean of the values?$
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107 $What is the algebraic sum of the deviations of the same set of values measured from 99?$
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108 $y$
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Question 5
Statistics. Asked once: NDA 1 2022 (same type asked 3 times)
103 $The variance of five positive observations is 3.6. If four of the observations are 2, 2, 4, 5 then what is the remaining observation?$
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Question 1