Question

Calculate the mean of the frequency distribution of the marks scored by 100 students in a mathematics test:
Marks 0-10 ,10-20, 20-30 ,30-40, 40-50
No. of students 20, 10 ,20 ,30 ,20

Answer 1

Answer:

here is your answer

Step-by-step explanation:

hope it.

Answer 2

Answer:

nhi ata y question muje

khn se late ho ese q ☺

Step-by-step explanation:

prove that tan^-1(1/5)+tan^-1(1/3)-tan^-1(21/33) =tan^-1(1/7)