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
Answers
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:
it will be 5
Step-by-step explanation:
hope it helps