Measures of Dis...

The $$P_82$$ for the following distribution is

In a group, $$2$$ students spend Rs$$8$$ daily, $$3$$ students spend Rs$$10$$ daily and $$5$$ students spend Rs$$6$$ daily. The average spending of all $$10$$ students is _______.

Given mean = $$70.2$$ and mode = $$70.5$$, find median using empirical relationship among them.

The mean of $$100$$ observations is $$18.4$$ and sum of sqares of deviations from mean is $$1444$$, the Co-efficient of variation is ______.

The mean of $$25$$ observations is $$73.408$$. If one observation $$64$$ is removed, the revised mean is ______.

For a grouped date, the formula for median is based on _______.

In a class of 100, the mean on a certain exam was 50, the standard deviation, 0. This means..........................

The following data show the number of hours worked by 200 statistics students:

A student obtained the mean and the standard deviation of 100 observations as 40 and 5.1. It was later found that one observation was wrongly copied as 50, the correct figure being 40. Find the correct mean and the S. D.

The standard deviation of the data:
$$x:$$ $$1$$  $$a$$  $${a}^{2}$$........$${a}^{n}$$
$$f:$$  $${ _{  }^{ n }{ C } }_{ 0 }$$  $${ _{  }^{ n }{ C } }_{ 1 }$$.....$${ _{  }^{ n }{ C } }_{ n }$$ is