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BITSAT Probability & Statistics — practice questions — page 4

Explore 117 free Probability & Statistics questions in BITSAT 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 91–117 of 117.

Signs in the expansionRead the answer and worked solution →Which formula does this belong to?Read the answer and worked solution →True or false: periodicityRead the answer and worked solution →Complete the complementary angle rulesRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Order the steps: convert degrees to radiansRead the answer and worked solution →Flip and pair: identity with its valueRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Tap every correct identityRead the answer and worked solution →Radians and degreesRead the answer and worked solution →True or false: reading the identitiesRead the answer and worked solution →Positive or negative angleRead the answer and worked solution →Which ratios are positiveRead the answer and worked solution →Type the trig functionRead the answer and worked solution →Pop what is defined everywhereRead the answer and worked solution →Which unit of angleRead the answer and worked solution →One word is wrongRead the answer and worked solution →Order the build upRead the answer and worked solution →Sine and cosineRead the answer and worked solution →Which one does not belongRead the answer and worked solution →Which way does it turnRead the answer and worked solution →Spot the false statementRead the answer and worked solution →Which ones belongRead the answer and worked solution →Knock out the true statementsRead the answer and worked solution →Trigonometry bingoRead the answer and worked solution →

Worked practice questions

Signs in the expansion

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Questions
  1. Question
    cos(x + y) expands with which sign in the middle?
    Choices
    1. plus
    2. no sign
    3. minus
    Correct choice
    minus
  2. Question
    sin(x + y) expands with which sign?
    Choices
    1. plus
    2. minus
    3. no sign
    Correct choice
    plus
  3. Question
    cos(x − y) expands with which sign?
    Choices
    1. minus
    2. plus
    3. no sign
    Correct choice
    plus
  4. Question
    sin(x − y) expands with which sign?
    Choices
    1. plus
    2. no sign
    3. minus
    Correct choice
    minus
The sign flips between the cosine and sine expansions, which is the usual slip. Source: syllabus Maths, Ch 3 Trigonometric Functions.

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Which formula does this belong to?

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Items
  1. Item
    cos x cos y − sin x sin y
    Category
    A cosine expansion
  2. Item
    cos x cos y + sin x sin y
    Category
    A cosine expansion
  3. Item
    sin x cos y + cos x sin y
    Category
    A sine expansion
  4. Item
    sin x cos y − cos x sin y
    Category
    A sine expansion
Categories
  1. Item
    A cosine expansion
  2. Item
    A sine expansion
Cosine expansions carry the opposite sign to sine expansions. Source: syllabus Maths, Ch 3 Trigonometric Functions.

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True or false: periodicity

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Questions
  1. Statement is true
    Yes
    Statement
    cos(2nπ + x) = cos x for any whole number n.
  2. Statement is true
    Yes
    Statement
    sin(2nπ + x) = sin x for any whole number n.
  3. Statement is true
    No
    Statement
    Adding 2π to the angle changes the sine value.
  4. Statement is true
    Yes
    Statement
    2π radians is a full turn.
  5. Statement is true
    Yes
    Statement
    π radians equals 180 degrees.
Adding a full turn changes nothing. Source: syllabus Maths, Ch 3 Trigonometric Functions.

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