Question

14. The mean of the following distribution is 50.
x 10 30 T 50
5a +3 32
T 70
7a-11
T
90
17
19
Find the value of a and hence the frequencies of 30 and 70.​

Answer 1

Answer

a =4.83

Step by step

1. Mean =sum of terms /total no. of terms

Mean =50

2. 7a-11+5a+3/14 =50

12a-8 =50

12a =50+8

12a =58

a =58/12

a =4.83