5, 8, 6 and k occur with frequency 3, 2, 4, and 1 respectively an d have a mean of 5.7. Find the value of k
-
A.
4 -
B.
3 -
C.
2 -
D.
1
Correct Answer: Option C
Explanation
x | f | fx |
5 | 3 | 15 |
8 | 2 | 16 |
6 | 4 | 24 |
k | i | k |
∑f=10 | ∑fx=55+k |
Mean = | ∑fx |
∑fx |
5.7 = | 55+k |
10 |
57 = 55 + k
k = 57 – 55
k = 2