NDA Probability & Statistics — practice questions

Explore 2 free Probability & Statistics questions in NDA Mathematics. Open each question or exercise to read its content, reference answers and available explanation.

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Probability & Statistics questions and exercises with answers

Showing questions 1–2 of 2.

Radians and degreesRead the answer and worked solution →True or false: reading the identitiesRead the answer and worked solution →

Worked practice questions

Radians and degrees

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Questions

Question
π radians in degrees is
Choices
1. 180
2. 90
3. 360
Correct choice
180
Question
2π radians in degrees is
Choices
1. 180
2. 360
3. 720
Correct choice
360
Question
90 degrees in radians is
Choices
1. π
2. π/4
3. π/2
Correct choice
π/2
Question
To go from degrees to radians, multiply by
Choices
1. π/180
2. 180/π
3. π
Correct choice
π/180

Converting in both directions. Source: syllabus Maths, Ch 3 Trigonometric Functions.

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True or false: reading the identities

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Questions

Statement is true
Yes
Statement
The Pythagorean identity lets you find cos from sin.
Statement is true
Yes
Statement
The sum formulae let you expand cos(x + y).
Statement is true
Yes
Statement
Periodicity means adding 2π leaves the value unchanged.
Statement is true
No
Statement
Every trigonometric identity holds only for acute angles.
Statement is true
Yes
Statement
Radian measure is proportional to degree measure.

How the identities are used in practice. Source: syllabus Maths, Ch 3 Trigonometric Functions.

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