Question

Q7 The mean marks obtained by 40 students in a test is 7.2, where a and b are missing data.
Find a and b.
Marks
5
6
8
9
No. of
students
6
a
16
13
b​

Answer 1

Step-by-step explanation:

pehle sbko multiple kro phir jo frequency aayegi usko plus kro phir jisme a and b de rkhe h us waale data ko bhi plus kro phir frequency waale data ko upon ke upar rkh do aur jo a and b wala data h usko niche aur = mein 7.2 toh solve krke a ki value nikal kr b ki value nikaal lena