Question

1) The mean of the following data is 16. Calculate the value of f.
(3)
Marks
ол
10
15
20
25
3
7
9
6
No. of
students
3
7
f
9
6​

Answer 1

Answer:

Value of f = 15 .

Step-by-step explanation:

We are given the mean of following data;

Marks (X) No. of students (F) X*F

5 3 15

10 7 70

15 f 15*f

20 9 180

25 6 150

∑F = 25 + f ∑X*F = 415 + 15*f

Mean of data, X bar = \frac{\sum XF}{\sum F}

∑F

∑XF

16 = \frac{415+15f}{25+f}

25+f

415+15f

16(25 + f) = 415 + 15*f

400 + 16*f = 415 + 15*f

16*f - 15*f = 415 - 400

f = 15

Answer 2

Answer:

it will be 5

Step-by-step explanation:

hope it helps