Mathematics
The following table gives the literacy rate (in percentage) of 35 cities. Find the mean literacy rate.
| Literacy rate (in %) | Number of cities |
|---|---|
| 45 - 55 | 3 |
| 55 - 65 | 10 |
| 65 - 75 | 11 |
| 75 - 85 | 8 |
| 85 - 95 | 3 |
Related Questions
To find out the concentration of SO2 (in parts per million, i.e., ppm), in the air, the data was collected for 30 localities in a certain city and is presented below :
Concentration of SO2 (in ppm) Frequency 0.00 - 0.04 4 0.04 - 0.08 9 0.08 - 0.12 9 0.12 - 0.16 2 0.16 - 0.20 4 0.20 - 0.24 2 Find the mean concentration of SO2 in the air.
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.
Number of days Number of students 0 - 6 11 6 - 10 10 10 - 14 7 14 - 20 4 20 - 28 4 28 - 38 3 38 - 40 1 The following table shows the ages of the patients admitted in a hospital during a year :
Age (in years) Number of patients 5 - 15 6 15 - 25 11 25 - 35 21 35 - 45 23 45 - 55 14 55 - 65 5 Find the mode and the mean of the data given above. Compare and interpret the two measures of central tendency.
The following data gives the information on the observed lifetimes (in hours) of 225 electrical components :
Lifetime (in hours) Frequency 0 - 20 10 20 - 40 35 40 - 60 52 60 - 80 61 80 - 100 38 100 - 120 29 Determine the modal lifetimes of the components.