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Air Force X & Y Group || Statistics

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Question 1

Consider the following measures of central tendency for a set of N numbers:

1) Arithmetic mean

2) Geometric mean

Which of the above uses/use all the data?

Question 2

If M is the mean of n observations x1 –k, x2 – k, x3 – k,…., xn – k, where k is any real number, then what is the mean of x1, x2, x3, ……, xn?

Question 3

For which of the following sets of numbers do the mean, median and mode have the same value?

Question 4

In a discrete data, if the median is double of the mean then, mode will how many times of the mean?

Question 5

The standard deviation of the observation 5, 5, 5, 5, 5 is:
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