Latika Leekha
Last Activity: 9 Years ago
Hello student,
Incorrect eman = 20 and incorrect S.D. =3.
Hence,
This gives Σ xi = 2000
corrected Σ xi = 2000-21-21-18 = 1940
correct mean = 1940/97 = 20.
Incorrect S.D. = 3
Incorrect variance = 9.
Correct Σxi2 = 40900 – 212 - 212 - 182
Correct Σxi2 = 39694
Hence, variance of remaining observations = 39694/ 97 – (20)2
= 409.216 – 400
= 9.216
Hence, corrected S.D. = √9.216 = 3.035