Question

mean of the following distribution is 18.1 find the missing frequency class interval 5-10 10-15 15-20 20-25 25-30 30-35 frequency 11 20 35 20 a 6 respectively​

Answer 1

Given :

Mean of the given frequency class interval is 18.1

5-10   10-15   15-20   20-25   25-30   30-35

11        20        35        20          a          6

To find :

The value of a.

Explanation :

Mean of the given observations is 18.1.

$Mean=\frac{\text{Sum of observations}}{\text{Total number of observation}}$

$18.1=\frac{11+20+35+20+a+6}{6}$

108.6 = a + 92

108.6 - 92 = a

a = 16.6

The missing frequency of class interval 25-30 is 16.6.

Answer 2

Answer:

Mean of the given frequency class interval is 18.1

5-10   10-15   15-20   20-25   25-30   30-35

11        20        35        20          a          6

To find :

The value of a.

Explanation :

Mean of the given observations is 18.1.

108.6 = a + 92

108.6 - 92 = a

a = 16.6

The missing frequency of class interval 25-30 is 16.6.

Step-by-step explanation: