1. 140 students participated in a knowledge retrieval session. 25 scored 90 out of 100; 63 scored 80 out of 100; 31 scored 70 out of 100; 15 scored 60 out of 100: 6 scored 50 on the
knowledge retrieval session. Determine the average score on this knowledge retrieval
session. Show all work.

76.14

Explanation:

The average will be the sum of all the marks that the students scored out of a hundred divided by the number of students.

25 scored 90

63 scored 80

31 scored 70

15 scored 60

6 scored 50

all the mentioned marks are out of hundred

Thus the average is given by

The average score of the students is 76.14.

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.