An object is placed 10 cm from a convex mirror of focal

The limits of multiple correlation coefficient R1.23 are:

For the frequency distribution of income (in lakh) of the employees in factory

The probability density function of a random variable X is f(x) = ( π /10) sin ( π x /5) ; 0 ≤ x ≤ 5. The first quartile of X is:

The interquartile range excludes ___ of the values.

The Pearson's correlation coefficient between following observation

Approximately, the coefficient of variation for the given data where Pearson's second measure of skewness = 0.42, arithmetic mean- 86 and median 80, is:

The sample sizes for two cases were 15 each with means as 104 and 114 respectively and variances as 200 and 510 respectively.

The second quartile for the following data 38, 39, 40, 52, 59, 67, 73, 77, 149, 248 is:

Which of the following is a sources of primary data?