Arihant Expert Team Solutions for Exercise 2: Practice Exercise

Mean of six observations $30, 68, 72, 53, 87$and $x$is $60$. Find the value of $x$.

The variance of a set of data is $169$. Then the standard deviation of the data is:

The standard deviation of the set $\{10, 10, 10, 10, 10\}$ is:

Find the range and mode of the data $17, 18, 28, 19, 16, 18, 17, 29, 18$.

Various expenditures incurred by a publishing company for publishing a book are given below.

If total expenditure on publishing a book be$₹ 100000$, expenditure on paper is how much more than that of transport?  

Following graph shows the income of a company in six different years.

Find the percentage decrease in income from $2001$to $2002$.

Find the variance and standard deviation for the following data $45, 60, 62, 62, 50, 65, 58, 68, 44, 48$.

Find the standard deviation and the variance of the first n natural numbers.