Question

Compute the mean of the following frequency distribution: Class 10-30 30-50 50-70 70-90 90-110
frequency 15 18 25 10 2. ​

Answer 1

Answer:

Step-by-step explanation:

Xi = 20        40    60     80    100                    total

Fi =  15          18    25     10       2                         70

XiFi = 300  720  1500  800  200                    3520

Mean = ∑XiFi/∑Fi

           =  3520/70

             = 50.28

Answer 2

Answer:

14

Step-by-step explanation:

15+18+25+10+2 = 70 ,     according to mean formula -----  sum of observations       / number of observations

70 /5 = 14        

i am not very sure but i think 14 , 10-30 class