Statistics Test...

The sum of the squares of deviations of a set of values is minimum when taken about:

The mean of 5 observations is 4.4. If three observations are 1,2 and 6 and the difference of the other two is 5, then the other two observations are:

The variance of numbers 3, 7, 10, 18 and 22 is equal to

If the angle between two lines of regression is 900 , then it represents

Which of the following statements is/are correct?

(i) Mode can be computed from histogram
(ii) Median is not independent of change of scale
(iii) Variance is independent of change of scale

A batsman scores runs in 10 innings as 38,70,48,34,42,55,63,46,54 and 44 , then the mean score is

If the mean of the first n natural numbers is equal to , then n is equal to

Mean of first n odd natural numbers is

The average marks of boys in a class are 52 and those of girls are 42. The average marks of boys and girls combined are 50. The percentage of boys in the class is

For symmetric distribution, which of the following should be true?

The average monthly salary of workers in a factory is Rs. 206. If the average monthly salaries of males and females respectively are Rs. 210 and Rs. 190, then the percentage of females employed in the factory is

If the standard deviation of 1, 2, 3, 4, & ..,10 is s, then the standard deviation of 11, 12, 13, 14, & ..20 is

The quartile deviation of the following items 12, 7, 15, 10, 16, 17, 25 is

Which of the following is a measure of central tendency?

If the variance of a data is V, then its standard deviation is

Find the mean of cubes of the first 'n' natural numbers.

For the following data, the mean of x is found to be 7.3. The missing frequency is

The most stable measure of central tendency is:

The two lines of regression are x + 4y = 3 and 3x +y = 15 . value of x for y = 3 is

What is the relationship between mean, median and mode for a moderately skewed distribution?

For a moderately skewed distribution, quartile deviation and the standard deviation are related by

The mean of 50 observations is 36. If two observations 30 and 42 are deleted, then the mean of the remaining observations is

You are collecting data from newspapers and magazines about price fluctuations of a branded product. What type of data are you referring to?

If r is the correlation coefficient, then

The AM of n numbers of a series is . If the sum of first (n - 1) terms is k, then the n^th number is