Question

calculate the mean through direct method of the following frequency distribution class 10-30, 30-50, 50-70, 70-90, 90-110, 110-130, frequency 5, 8, 12, 20, 3, 2,​

Answer 1

Answer:

Mean using direct method = 65.6

Step-by-step explanation:

The data given is below

Class          Mean of the class             Frequency

10 - 30         20                                     5

30 - 50        40                                    8

50 - 70         60                                   12

70 - 90         80                                    20

90 - 110         100                                   3

110 - 130         120                                  2

From the above table, the mean for discrete class is given by

Mean using direct method for discrete class = ∑fX/∑f

∑fX = Sum of products of values of item and corresponding frequencies.

∑f = sum of frequencies.  = 50

∑fX = (20*5) + (40*8) + (60*12) + (80*20) + (100*3) + (120*2)

= 100 + 320 + 720 + 1600 + 300 + 240

= 3280

Mean using direct method = 3280/50 = 65.6

Answer 2

Answer:

Step-by-step explanation:

Here u go