Measures of Cen...

Thirty women were examined in a hospital by a doctor and the number of heart beats per minute were recorded and summarised as follows. Find the mean heart beats per minute for these women, choosing a suitable method.

The following table gives the literacy rate (in percentage) of $$35$$ cities. Find the mean literacy rate.

The following table shows the ages of the patients admitted in a hospital during a year:

To find out the concentration of $$SO_2$$ in the air (in parts per million, i.e., ppm), the data was collected for 30 localities in a certain city and is presented below:

A class teacher has the following absentee record of 40 students of a class for the whole term. Find the mean number of days a student was absent.

The table below shows the daily expenditure on food of 25 households in a locality.

Consider the following distribution of daily wages of 50 workers of a factory.

In a group of students, the mean weight of boys is $$65$$ kg. and mean weight of girls is $$55$$ kg. If the mean weight of all students of group is $$61$$ kg, then the ratio of the number of boys and girls in the group is

The median of a set of eight numbers is $$4.5$$. Given that seven of the numbers are $$7, 2,3, 4,8,2$$ and $$1$$ find the eighth number and write down the mode of eight numbers.

The mean of $$1, 7, 5, 3, 4$$ and $$4$$ is $$m$$. The observations $$3, 2, 4, 2, 3, 3$$ and $$p$$ have the mean $$(m - 1)$$. Find the median of the second set of data.