Question

Find the mean of the following data using step deviation method.

Class Interval

0-10

10-20

20-30

30-40

40-50

50-60

60-70

Frequency

4

4

7

10

12

8
5​

Answer 1

Answer:

toooo long question

Step-by-step explanation:

.I.                 Frequency (fi)     Mid-value(x)        di=hx−a        fidi20−301025−2−2030−40635−1−640−508450050−60125511260−7056521070−80975327∑fi=50∑fidi=23

Here, a=45 and h=10

∴ Mean =a+∑fi∑fidi×h

=45+50