Question

2. Calculate arithmetic mean from the following data by short cut method: (3)

Marks Below 10 10-20 20-30 30-40 40-50 Above 50

No. of

students 4 6 10 15 8 7




3. Following table gives study hours in a week by 100 students of class XI. Find out the arithmetic mean by step deviation method: (4)

Hours <10 <20 <30 <40 <50 <60

No. of

students 2 6 35 62 80 100

Answer 1

Explanation:

in this we have to do so much of calculation.