Question

Find the mean of the following data:

Marks (in

percentage)

0-20 20-40 40-60 60-80 80-100

Number of

students

8 12 30 30 10​

Answer 1

Step-by-step explanation:

xi fi

0-20 8= 160

20-40 12=480

40-60 30=1800

60-80 30=2400

80-100 10=1000

=180

Answer 2

Answer:

mean = 54.89

Step-by-step explanation:

I have used here step deviation method u can also use other method also