MathematicsMedium89×since 2002Q5493If the mean and variance of five observations are 245\frac{24}{5}524 and 19425\frac{194}{25}25194 respectively and the mean of the first four observations is 72\frac{7}{2}27, then the variance of the first four observations in equal toA54\frac{5}{4}45B45\frac{4}{5}54C1054\frac{105}{4}4105D7712\frac{77}{12}1277Check answerSkip