Question

The mean of 5 observations is $\frac {24}{5}$ and variance is $\frac {194}{25}$ . If the mean of first four observations is $\frac 72$ , then the variance of first four observations is

• A. $\frac 32$
• B. $\frac 52$
• C. $\frac 54$
• D. $\frac 23$

Answer 1

Answer: (C)

$\frac 54$

Answer 2

The correct option is (C): $\frac 54$.