Question

For the following distribution, calculate mean using all suitable methods:
class interval: 1-4 4-9 9-16 16-27
Frequency: 6 12 26 20

Answer 1

Mean of the class interval = 13.5

Given:

• Class interval: 1-4   4-9   9-16   16-27
• Frequency:       6     12     26      20

To find:

       Mean of the class interval.

Explanation:

Find the Mid value of class interval : 1-4      4-9      9-16      16-27

                                  Mid value (X)  : 2.5     6.5       12.5       21.5

                                  Frequency(F)  :  6        12        26         20

        Mid value (X) ×  Frequency(F) :  15       78        325      430

                                                 ∑ (F) : 6 + 12 + 26 + 20 = 64

                                          ∑ (X) × (F) : 15 + 78 + 325 + 430 = 848

Mean of the class interval = $\frac{summation \ of\ (X) (F)}{summation \ of \ (F)}$

                                           = $\frac{848}{64}$ = 13.5

To learn more....

1 The mean age of a group of 100 children was 9.35 years the mean age of 25 of them was 8.75 years and that of another 65 of them was 10.51 years whar is the mean age of the remaining children​

brainly.in/question/10972224

2 The mean of 25 observation is 65 and mean of next 10 observation is 62 find the mean of all 35 observation.

brainly.in/question/2396151