An average value is the central value that is calculated by dividing the sum of all the numbers by how many numbers there are.
AVERAGE = Total of all units / Number of units
Raisa scores 91 in mathematics, 93 in science, 75 in social science, 94 in religion, 82 in English and 81 in Bengali. Her marks on the report card will be the average of these 6 subjects. What is the average mark in her report card?
Total marks: 91+93+75+94+82+81 = 516
Number of subjects: 6
Average = Total marks / Total subjects
= 516÷6
= 86
Solve these following problems:
- A man works 4 days a week. On Sunday he works 12hours, on Monday 8hours, on Wednesday 10hrs and on Thursday 6hrs. What is his average work time per week?
- A student scores 90 in math in his first exam, 60 in second and 60 in the third exam. What is his average mark?
- A girl goes to school 80 days first semester, 40 days in next 3 semester, 70 days in next semester and 30 days in next 3 semester. Calculate the average days she goes school per year. (hint : 1 year consists of 4 semesters)
- A village has four districts. The population in the first district was 100. In the second district the population was 50, in the third it was 50 and in the fourth one it was 140. What is the average population of the village?
- A boy studies for 4 hours each on Sunday, Monday, Tuesday and studies 6 hours Wednesday, Thursday, Friday. On Saturdays he studies for 5hours. Find his average study time on a week.