Question

please answer this question ​

Answer 1

Answer:

Mean marks=18.56

Step-by-step explanation:

Here, cumulative frequencies are 3,10,25,49,65,73,78,80

Number of students

3

10-3=7

25-10=15

49-25=24

65-49=16

73-65=8

78-73=5

80-78=2

Sum of all frequencies=3+7+15+24+16+8+5+2=80