Question

There were three questions on the test

each question was worth 5 marks
Each Question was marked right or wrong(no part marks).
30% of the students got all 3 questions correct
40% of the students got exactly 2 question correct
25% of the students got exactly 1 question correct
5% of the students got no questions correct

Determine The overall clas average(mean)

Answer 1

9.75 marks

Explanation:

30% of the students got 15 marks (3 questions)

40% of the students got 10 marks (2 questions)

25% of the students got 5 marks (1 question)

5% of the students got 0 marks (0 questions)

0.3(15)+0.4(10)+0.25(5)+0.05(0)/1

the one as denominator represents all students that took the test

4.5+4+1.25+0

9.75

the class average is 9.75