If the mean of frequency distribution is 7.5 and ∑fi xi = 120 + 3k, ∑fi = 30, then k is equal to:
A. 40
B. 35
C. 50
D. 45
Answer:B
If the mean of frequency distribution is 7.5 and ∑fi xi = 120 + 3k, ∑fi = 30, then k is equal to:
A. 40 B. 35 C. 50 D. 45
Explanation: As per the given question,