The arithmetic mean of 100 observations is 40. Later, it was foun

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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


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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


B.

39.7

We know thatArithmatic mean = Total sum of observationsNumber of observationsTotal sum of observations = 40 X 1000 = 4000Correct Arithmatic mean = 4000 + 53 - 83100 = 39.70


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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


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