Question

ans question 6 no 2 please answer

Answer 1

hope this answer is helpful

Answer 2

The given data is discontinuous .

The data changed to continuous is :-

Marks                      No. of students

5 - 10                           30 - 23 = 7

10 - 15                          23 - 8 = 15

15 - 20                         8 - 2 = 6

20 - 25                         2

Direct method to calculate mean .

Number of students = 17 + 15 + 6 + 2 = 30 .

fixi = 7 × 7.5 + 12.5 × 15 + 17.5 × 6 + 22.5 × 2

⇒ fixi = 390

Mean = fixi / fi

⇒ 390/30

⇒ 13

∴ Mean is 13 .