View Policies Current Attempt in Progress The data from 200 endothermic reactions involving sodium bicarbonate are summarized as follows: Final Temperature Conditions |Number of Reactions 266 K 22 271 K 60 274K 118 Let the random variable X denote the final temperature in kelvins. Calculate the mean and variance for X. Round your answers to two decimal places (e.g. 98.76). E(X) = K V(X)= K2