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Statistics Test...

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  • Question 1
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    The mean of six numbers is 23. If one of the numbers is excluded, the mean of the remaining numbers becomes 20. The excluded number is

  • Question 2
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    The mean of five observations is 15. If the mean of first three observations is 14 and that of last three is 17, then the third observation is

  • Question 3
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    The mean of 50 observations is 39. If one of the observations which was 23 was replaced by 43, the resulting mean will be

  • Question 4
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    There are 50 numbers. Each number is subtracted from 53 and the difference between the mean of the numbers so obtained is found to be  3.5. The mean of the given number is

  • Question 5
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    The traffic police recorded the speed (in km/h) of 10 motorists as 48, 52, 57, 55, 42, 39, 60, 49, 53 and 47. Later an error in recording instrument was found. If the instrument has recorded the speed 5 km/h less in each case, then the correct average speed of the motorists is

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