JEE Main & Advanced
AIEEE Paper (Held On 11 May 2011)
question_answer
A scientist is weighing each of 30 fishes. Their mean weight worked out is 30 gm and a standard deviation of gm. Later, it was found that the measuring scale was misaligned and always under reported every fish weight by 2 gm. The correct mean and standard deviation (ingm) of fishes are respectively:
AIEEE Solved Paper (Held On 11 May 2011)
A) 32,2
B) 32,4
C) 28,2
D) 28,4
Correct Answer:
A
Solution :
Correct mean = observed mean + 2 30 + 2 = 32 Correct S.D. = observed S.D. = 2