Statistics-And-Probability Question 647
Question: One set containing five members has mean 8, variance 18 and the second set containing three members has mean 8 and variance 24. The variance of combined set of numbers is
Options:
A) 24
B) 20.25
C) 22.25
D) None of these
Show Answer
Answer:
Correct Answer: B
Solution:
[b] $ {{\sigma }^{2}}=\frac{5.18+3.24}{5+3}+(8-8)\frac{15}{64}=20.25. $
BETA
