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  • Question

  • The mean of 100 observations is 40. It is found that an observation 84 was misread as 48. Then the correct mean is ?


  • Options
  • A. 40.36
  • B. 41.24
  • C. 41.92
  • D. 42.05

  • Correct Answer
  • 40.36 

    Explanation

    Given,

    mean of 100 observations is 40

    => Total of 100 observations = 40 x 100 = 4000

    84 is misread as 48

    => Difference = 84 - 48 = 36

    => Now, new total of 100 observations = 4000 + 36 = 4036

    Correct Mean = 4036/100 = 40.36

    • More questions

    • 1. If x2-2x+1=0, then the value of x4+1x4 is

    • Options
    • A. 0
    • B. 1
    • C. 2
    • D. 3
      • Discuss
    • 2. The length of a median of an equilateral triangle is 12?3 cms. Then the area of the triangle is

    • Options
    • A. 144 sq. cms
    • B. 288?3 sq. cms
    • C. 144?3 sq. cms
    • D. 288sq.cms
      • Discuss
    • 3. 0 is the circumference of a triangle ?ABC . The point A and the chord BC are on the opposite side of O. If ?BOC=150° then the value of ?BAC is

    • Options
    • A. 65°
    • B. 60°
    • C. 70°
    • D. 75°
      • Discuss
    • 4. In an acute-angled triangle ABC is Sin(B+A+C)= 32 and tan(C+A-B)=1, then C is equal to

    • Options
    • A. 37.5°
    • B. 67.5°
    • C. 52.5°
    • D. 72.5°
      • Discuss
    • 5. If SinX-CosX=1, where 'X' is an acute angle, the value of SinX+CosX is

    • Options
    • A. 0
    • B. 1
    • C. 1/2
    • D. 2
      • Discuss
    • 6. If (x ? y) = 7, then what is the value of (x ? 15)3 ? (y ? 8)3 ?

    • Options
    • A. 0
    • B. 343
    • C. 392
    • D. 399
      • Discuss
    • 7. If (1/x) + (1/y) + (1/z) = 0 and x + y + z = 9, then what is the value of x3 + y3 + z3 ? 3xyz ?

    • Options
    • A. 81
    • B. 361
    • C. 729
    • D. 6561
      • Discuss
    • 8. If x4 + (1/x4) = 34 , then what is the value of x3 ? (1/x3) ?

    • Options
    • A. 0
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    • D. 14
      • Discuss
    • 9. If x = 1 ? y and x2 = 2 ? y2 , then what is the value of xy?

    • Options
    • A. 1
    • B. 2
    • C. -1/2
    • D. -1
      • Discuss
    • 10. What is the simplified value of (sec A + cos A)(sec A ? cos A)?

    • Options
    • A. 2 tan2A
    • B. 2 sin2 A
    • C. sin2 A tan2 A
    • D. sin2A + tan2 A
      • Discuss

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