If ∑xi = 20, ∑xi2 = 200 and n = 10 for an obser

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 Multiple Choice QuestionsMultiple Choice Questions

91.

The term independent of x in the binomial expansion of 2x2 - x10 is equal to ?

  • 180

  • 120

  • 90

  • 72


92.

The numbers 4 and 9 have frequencies x and (x 1) respectively. If their arithmetic mean is 6, then what is the value of x ?

  • 2

  • 3

  • 4

  • 5


93.

What is the sum of the last five coefficients in the expansion of (1 + x)9 when it is expanded in ascending powers of x ?

  • 256

  • 512

  • 1024

  • 2048


94.

The arithmetic mean of 100 observations is 40. Later, it was found that an observation ‘53’ was wrongly read as ‘83’. What is the correct arithmetic mean ?

  • 39.8

  • 39.7

  • 39.6

  • 39.5


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95.

If ∑xi = 20, ∑xi2 = 200 and n = 10 for an observed variable x, then what is the coefficient of variation ?

  • 80

  • 100

  • 150

  • 200


D.

200

Coefficient of variation = Standard DeviationMean × 100Mean = xin = 2010= 2Standard Deviation = 1nnxi2 - xi2= 11010200 - 202= 4Coefficient of variation = 42 × 100= 200


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