6
Q:

X attempts 94 questions and gets 141 marks. If for every correct answer 4 marks is given, and for every wrong answer 1 mark is deducted, then the number of questions wrongly answered by X is __.

A) 45 B) 47
C) 57 D) 40

Answer:   B) 47



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Q:

If the standard deviation of a population is 10, what would be the population variance?

A) 100 B) 30
C) 5 D) 20
 
Answer & Explanation Answer: A) 100

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0 77
Q:

The mean of 20 observations is 19. One more observation is included and the new mean becomes 20. The 21st observation is

A) 20 B) 30
C) 40 D) 42
 
Answer & Explanation Answer: C) 40

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0 88
Q:

The mean of a distribution is 18 and the standard deviation is 4.5. What is the value of the coefficient of variation?

A) 50% B) 25%
C) 100% D) 75%
 
Answer & Explanation Answer: B) 25%

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0 95
Q:

The mean of the data 2, 9, 9, 3, 6, 9, 4 is

A) 33/7 B) 6
C) 43/7 D) 7
 
Answer & Explanation Answer: B) 6

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3 192
Q:

The variance of a set of data is 121. Then the standard deviation of the data is

A) +-11 B) 11
C) 21 D) 60.5
 
Answer & Explanation Answer: B) 11

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0 212
Q:

Variance of the data 2, 4, 5, 6, 8, 17 is 23.33. Then the variance of 4, 8, 10, 12, 16, 34 will be

 

A) 11.66 B) 46.66
C) 93.3333 D) 4.83
 
Answer & Explanation Answer: C) 93.3333

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5 496
Q:

The variance of a set of data is 196. Then the standard deviation of the data is

 

A) +-14 B) 14
C) 96 D) 98
 
Answer & Explanation Answer: B) 14

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1 884
Q:

If the standard deviation of a population is 6.5, what would be the population variance?

A) 40.25 B) 42.25
C) 18.25 D) 13
 
Answer & Explanation Answer: B) 42.25

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1 341