Question

Find the mean of each of the following frequency distributions:
class interval: 0-8 8-16 16-24 24-32 32-40
Frequency: 5 9 10 8 8

Answer 1

Answer:

gsf

Step-by-step explanation:

gs

sggs

d

Answer 2

Mean = 16.4

Step-by-step explanation:

Let us assume A = 20.

Please refer to the attached picture for the table.

class interval: 0-8 8-16 16-24 24-32 32-40

midpoint (x1)  : 4    12   20    28  36

d1 = x1 - 20   : -16  -8   0     8    16

u1 - x1-20/8   :  -2   -1  0     1    1

 Frequency f1 : 5    9    10    8   8

f1u1          : -10   -6   0    3    4

 Sum of frequency = 20

Sum of f1u1 = -9

We have A = 20 and h = 8

Mean = A + h (sum of f1u1/sum of f)

    = 20 + 8 (-9/20)

    = 20 + -72/20

    = 20 - 3.6

Mean = 16.4