In a class of 250 students what is the mean variance and standard deviation if we assume normality and use the normal distribution as an approximation of the binomial distribution Answer choices rounded to the nearest whole number a Mean 54 Variance 8 Standard Deviation 62 b Mean 135 Variance 62 Standard Deviation 8 c Mean 53 Variance 62 Standard Deviation 8 d Mean 135 Variance 8 Standard Deviation 62