The mean and standard deviation of the marks of \(10\) students were found to be \(50\) and \(12\) respectively. Later, …

The mean and standard deviation of the marks of \(10\) students were found to be \(50\) and \(12\) respectively. Later, it was observed that two marks \(20\) and \(25\) were wrongly read as \(45\) and \(50\) respectively. Then the correct variance is..........